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Web Client for Visualizing Pandas Objects

Project description


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What is it?

D-Tale is the combination of a Flask back-end and a React front-end to bring you an easy way to view & analyze Pandas data structures. It integrates seamlessly with ipython notebooks & python/ipython terminals. Currently this tool supports such Pandas objects as DataFrame, Series, MultiIndex, DatetimeIndex & RangeIndex.


D-Tale was the product of a SAS to Python conversion. What was originally a perl script wrapper on top of SAS’s insight function is now a lightweight web client on top of Pandas data structures.

Where To get It

The source code is currently hosted on GitHub at:

Binary installers for the latest released version are available at the Python package index and on conda using conda-forge.

# conda
conda install dtale -c conda-forge
# if you want to also use "Export to PNG" for charts
conda install -c plotly python-kaleido
# or PyPI
pip install dtale

Getting Started

PyCharm jupyter
image9 image10

Python Terminal

This comes courtesy of PyCharm image11 Feel free to invoke python or ipython directly and use the commands in the screenshot above and it should work

Issues With Windows Firewall

If you run into issues with viewing D-Tale in your browser on Windows please try making Python public under “Allowed Apps” in your Firewall configuration. Here is a nice article: How to Allow Apps to Communicate Through the Windows Firewall

Additional functions available programmatically

import dtale
import pandas as pd

df = pd.DataFrame([dict(a=1,b=2,c=3)])

# Assigning a reference to a running D-Tale process
d =

# Accessing data associated with D-Tale process
tmp =
tmp['d'] = 4

# Altering data associated with D-Tale process
# FYI: this will clear any front-end settings you have at the time for this process (filter, sorts, formatting) = tmp

# Shutting down D-Tale process

# using Python's `webbrowser` package it will try and open your server's default browser to this process

# There is also some helpful metadata about the process
d._data_id  # the process's data identifier
d._url  # the url to access the process

d2 = dtale.get_instance(d._data_id)  # returns a new reference to the instance running at that data_id

dtale.instances()  # prints a list of all ids & urls of running D-Tale sessions

Duplicate data check

To help guard against users loading the same data to D-Tale multiple times and thus eating up precious memory, we have a loose check for duplicate input data. The check runs the following: * Are row & column count the same as a previously loaded piece of data? * Are the names and order of columns the same as a previously loaded piece of data?

If both these conditions are true then you will be presented with an error and a link to the previously loaded data. Here is an example of how the interaction looks: image12

As A Script

D-Tale can be run as script by adding subprocess=False to your command. Here is an example script:

import dtale
import pandas as pd

if __name__ == '__main__':[1,2,3,4,5]), subprocess=False)

Jupyter Notebook

Within any jupyter (ipython) notebook executing a cell like this will display a small instance of D-Tale in the output cell. Here are some examples: assignment instance
image13 image14 image15

If you are running ipython<=5.0 then you also have the ability to adjust the size of your output cell for the most recent instance displayed:


One thing of note is that a lot of the modal popups you see in the standard browser version will now open separate browser windows for spacial convienence:

Column Menus Correlations Describe Column Analysis Instances
image17 image18 image19 image20 image21

JupyterHub w/ Jupyter Server Proxy

JupyterHub has an extension that allows to proxy port for user, JupyterHub Server Proxy

To me it seems like this extension might be the best solution to getting D-Tale running within kubernetes. Here’s how to use it:

import pandas as pd

import dtale
import as dtale_app

dtale_app.JUPYTER_SERVER_PROXY = True[1,2,3]))

Notice the command dtale_app.JUPYTER_SERVER_PROXY = True this will make sure that any D-Tale instance will be served with the jupyter server proxy application root prefix:

/user/{jupyter username}/proxy/{dtale instance port}/

One thing to note is that if you try to look at the _main_url of your D-Tale instance in your notebook it will not include the hostname or port:

import pandas as pd

import dtale
import as dtale_app


d =[1,2,3]))
d._main_url # /user/johndoe/proxy/40000/dtale/main/1

This is because it’s very hard to promgramatically figure out the host/port that your notebook is running on. So if you want to look at _main_url please be sure to preface it with:

http[s]://[jupyterhub host]:[jupyterhub port]

If for some reason jupyterhub changes their API so that the application root changes you can also override D-Tale’s application root by using the app_root parameter to the show() function:

import pandas as pd

import dtale
import as dtale_app[1,2,3]), app_root='/user/johndoe/proxy/40000/`)

Using this parameter will only apply the application root to that specific instance so you would have to include it on every call to show().

JupyterHub w/ Kubernetes

Please read this post

Docker Container

If you have D-Tale installed within your docker container please add the following parameters to your docker run command.

On a Mac:

docker run -h `hostname` -p 40000:40000
  • -h this will allow the hostname (and not the PID of the docker container) to be available when building D-Tale URLs
  • -p access to port 40000 which is the default port for running D-Tale

On Windows:

docker run -p 40000:40000

Everything Else:

docker run -h `hostname` --network host
  • -h this will allow the hostname (and not the PID of the docker container) to be available when building D-Tale URLs
  • --network host this will allow access to as many ports as needed for running D-Tale processes

Google Colab

This is a hosted notebook site and thanks to Colab’s internal function google.colab.output.eval_js & the JS function google.colab.kernel.proexyPort users can run D-Tale within their notebooks.

DISCLAIMER: It is important that you set USE_COLAB to true when using D-Tale within this service. Here is an example:

import pandas as pd

import dtale
import as dtale_app

dtale_app.USE_COLAB = True[1,2,3]))

If this does not work for you try using USE_NGROK which is described in the next section.


This is yet another hosted notebook site and thanks to the work of flask_ngrok users can run D-Tale within their notebooks.

DISCLAIMER: It is import that you set USE_NGROK to true when using D-Tale within this service. Here is an example:

import pandas as pd

import dtale
import as dtale_app

dtale_app.USE_NGROK = True[1,2,3]))

Here are some video tutorials of each:

Service Tutorial Addtl Notes
Google Colab image22  
Kaggle image23 make sure you switch the “Internet” toggle to “On” under settings of your notebook so you can install the egg from pip

It is important to note that using NGROK will limit you to 20 connections per mintue so if you see this error:


Wait a little while and it should allow you to do work again. I am actively working on finding a more sustainable solution similar to what I did for google colab. :pray:


I have built a repo which shows an example of how to run D-Tale within Binder here.

The important take-aways are: * you must have jupyter-server-proxy installed * look at the environment.yml file to see how to add it to your environment * look at the postBuild file for how to activate it on startup

R with Reticulate

I was able to get D-Tale running in R using reticulate. Here is an example:

dtale <- import('dtale')
df <- read.csv('')
dtale$show(df, subprocess=FALSE, open_browser=TRUE)

Now the problem with doing this is that D-Tale is not running as a subprocess so it will block your R console and you’ll lose out the following functions: - manipulating the state of your data from your R console - adding more data to D-Tale

open_browser=TRUE isn’t required and won’t work if you don’t have a default browser installed on your machine. If you don’t use that parameter simply copy & paste the URL that gets printed to your console in the browser of your choice.

I’m going to do some more digging on why R doesn’t seem to like using python subprocesses (not sure if it something with how reticulate manages the state of python) and post any findings to this thread.

Here’s some helpful links for getting setup:


installing python packages

Startup with No Data

It is now possible to run D-Tale with no data loaded up front. So simply call and this will start the application for you and when you go to view it you will be presented with a screen where you can upload either a CSV or TSV file for data.


Once you’ve loaded a file it will take you directly to the standard data grid comprised of the data from the file you loaded. This might make it easier to use this as an on demand application within a container management system like kubernetes. You start and stop these on demand and you’ll be presented with a new instance to load any CSV or TSV file to!


Base CLI options (run dtale --help to see all options available)

Prop Description
--host the name of the host you would like to use (most likely not needed since socket.gethostname() should figure this out)
--port the port you would like to assign to your D-Tale instance
--name an optional name you can assign to your D-Tale instance (this will be displayed in the <title> & Instances popup)
--debug turn on Flask’s “debug” mode for your D-Tale instance
--no-reaper flag to turn off auto-reaping subprocess (kill D-Tale instances after an hour of inactivity), good for long-running displays
--open-browser flag to automatically open up your server’s default browser to your D-Tale instance
--force flag to force D-Tale to try an kill any pre-existing process at the port you’ve specified so it can use it

Loading data from arctic(high performance datastore for pandas dataframes) (this requires either installing arctic or dtale[arctic])

dtale --arctic-host mongodb://localhost:27027 --arctic-library jdoe.my_lib --arctic-node my_node --arctic-start 20130101 --arctic-end 20161231

Loading data from CSV

dtale --csv-path /home/jdoe/my_csv.csv --csv-parse_dates date

Loading data from EXCEL

dtale --excel-path /home/jdoe/my_csv.xlsx --excel-parse_dates date
dtale --excel-path /home/jdoe/my_csv.xls --excel-parse_dates date

Loading data from JSON

dtale --json-path /home/jdoe/my_json.json --json-parse_dates date


dtale --json-path http://json-endpoint --json-parse_dates date

Loading data from R Datasets

dtale --r-path /home/jdoe/my_dataset.rda

Loading data from SQLite DB Files

dtale --sqlite-path /home/jdoe/test.sqlite3 --sqlite-table test_table

Custom Command-line Loaders

Loading data from a Custom loader - Using the DTALE_CLI_LOADERS environment variable, specify a path to a location containing some python modules - Any python module containing the global variables LOADER_KEY & LOADER_PROPS will be picked up as a custom loader - LOADER_KEY: the key that will be associated with your loader. By default you are given arctic & csv (if you use one of these are your key it will override these) - LOADER_PROPS: the individual props available to be specified. - For example, with arctic we have host, library, node, start & end. - If you leave this property as an empty list your loader will be treated as a flag. For example, instead of using all the arctic properties we would simply specify --arctic (this wouldn’t work well in arctic’s case since it depends on all those properties) - You will also need to specify a function with the following signature def find_loader(kwargs) which returns a function that returns a dataframe or None - Here is an example of a custom loader:

from dtale.cli.clickutils import get_loader_options

  IMPORTANT!!! This global variable is required for building any customized CLI loader.
  When find loaders on startup it will search for any modules containing the global variable LOADER_KEY.
LOADER_KEY = 'testdata'
LOADER_PROPS = ['rows', 'columns']

def test_data(rows, columns):
    import pandas as pd
    import numpy as np
    import random
    from past.utils import old_div
    from pandas.tseries.offsets import Day
    from dtale.utils import dict_merge
    import string

    now = pd.Timestamp(pd.Timestamp('now').date())
    dates = pd.date_range(now - Day(364), now)
    num_of_securities = max(old_div(rows, len(dates)), 1)  # always have at least one security
    securities = [
        dict(security_id=100000 + sec_id, int_val=random.randint(1, 100000000000),
             str_val=random.choice(string.ascii_letters) * 5)
        for sec_id in range(num_of_securities)
    data = pd.concat([
        pd.DataFrame([dict_merge(dict(date=date), sd) for sd in securities])
        for date in dates
    ], ignore_index=True)[['date', 'security_id', 'int_val', 'str_val']]

    col_names = ['Col{}'.format(c) for c in range(columns)]
    return pd.concat([data, pd.DataFrame(np.random.randn(len(data), columns), columns=col_names)], axis=1)

# IMPORTANT!!! This function is required for building any customized CLI loader.
def find_loader(kwargs):
    test_data_opts = get_loader_options(LOADER_KEY, LOADER_PROPS, kwargs)
    if len([f for f in test_data_opts.values() if f]):
        def _testdata_loader():
            return test_data(int(test_data_opts.get('rows', 1000500)), int(test_data_opts.get('columns', 96)))

        return _testdata_loader
    return None

In this example we simplying building a dataframe with some dummy data based on dimensions specified on the command-line: - --testdata-rows - --testdata-columns

Here’s how you would use this loader:

DTALE_CLI_LOADERS=./path_to_loaders bash -c 'dtale --testdata-rows 10 --testdata-columns 5'


You can choose to use optional authentication by adding the following to your D-Tale .ini file (directions here):

active = True
username = johndoe
password = 1337h4xOr

Or you can call the following:

import dtale.global_state as global_state

global_state.set_auth_settings({'active': True, 'username': 'johndoe', 'password': '1337h4x0r'})

If you have done this before initially starting D-Tale it will have authentication applied. If you are adding this after starting D-Tale you will have to kill your service and start it over.

When opening your D-Tale session you will be presented with a screen like this:


From there you can enter the credentials you either set in your .ini file or in your call to dtale.global_state.set_auth_settings and you will be brought to the main grid as normal. You will now have an additional option in your main menu to logout:


Instance Settings

Users can set front-end properties on their instances programmatically in the function or by calling the update_settings function on their instance. For example:

import dtale
import pandas as pd

df = pd.DataFrame(dict(
  column_formats={'a': {'fmt': '0.0000'}},


import dtale
import pandas as pd

df = pd.DataFrame(dict(
d =
  column_formats={'a': {'fmt': '0.0000'}},

Here’s a short description of each instance setting available:


A list of column names you would like displayed in your grid. Anything else will be hidden.


A list of column names you would like initially hidden from the grid display.


A dictionary of column name keys and their front-end display configuration. Here are examples of the different format configurations: * Numeric: {'fmt': '0.00000'} * String: * {'fmt': {'truncate': 10}} truncate string values to no more than 10 characters followed by an ellipses * {'fmt': {'link': True}} if your strings are URLs convert them to clickable links * {'fmt': {'html': True}} if your strings are HTML fragments render them as HTML * Date: {'fmt': 'MMMM Do YYYY, h:mm:ss a'} uses Moment.js formatting


Converts any nan values in your dataframe to this when it is sent to the browser (doesn’t actually change the state of your dataframe)


List of tuples which sort your dataframe (EX: [('a', 'ASC'), ('b', 'DESC')])


List of column names which will be locked to the right side of your grid while you scroll to the left.


A string denoting one of the many background displays available in D-Tale. Options are: * heatmap-all: turn on heatmap for all numeric columns where the colors are determined by the range of values over all numeric columns combined * heatmap-col: turn on heatmap for all numeric columns where the colors are determined by the range of values in the column * heatmap-col-[column name]: turn on heatmap highlighting for a specific column * dtypes: highlight columns based on it’s data type * missing: highlight any missing values (np.nan, empty strings, strings of all spaces) * outliers: highlight any outliers * range: highlight values for any matchers entered in the “range_highlights” option * lowVariance: highlight values with a low variance


Dictionary of column name keys and range configurations which if the value for that column exists then it will be shaded that color. Here is an example input:

'a': {
  'active': True,
  'equals': {'active': True, 'value': 3, 'color': {'r': 255, 'g': 245, 'b': 157, 'a': 1}}, # light yellow
  'greaterThan': {'active': True, 'value': 3, 'color': {'r': 80, 'g': 227, 'b': 194, 'a': 1}}, # mint green
  'lessThan': {'active': True, 'value': 3, 'color': {'r': 245, 'g': 166, 'b': 35, 'a': 1}}, # orange


If set to True then the headers in your grid will be rotated 90 degrees vertically to conserve width. image28

Predefined Filters

Users can build their own custom filters which can be used from the front-end using the following code snippet:

import pandas as pd
import dtale
import dtale.predefined_filters as predefined_filters
import dtale.global_state as global_state


        "name": "A and B > 2",
        "column": "A",
        "description": "Filter A with B greater than 2",
        "handler": lambda df, val: df[(df["A"] == val) & (df["B"] > 2)],
        "input_type": "input",
        "default": 1,
        "active": False,
        "name": "A and (B % 2) == 0",
        "column": "A",
        "description": "Filter A with B mod 2 equals zero (is even)",
        "handler": lambda df, val: df[(df["A"] == val) & (df["B"] % 2 == 0)],
        "input_type": "select",
        "default": 1,
        "active": False,
        "name": "A in values and (B % 2) == 0",
        "column": "A",
        "description": "A is within a group of values and B mod 2 equals zero (is even)",
        "handler": lambda df, val: df[df["A"].isin(val) & (df["B"] % 2 == 0)],
        "input_type": "multiselect",
        "default": [1],
        "active": True,

df = pd.DataFrame(
    ([[1, 2, 3, 4, 5, 6], [7, 8, 9, 10, 11, 12], [13, 14, 15, 16, 17, 18]]),
    columns=['A', 'B', 'C', 'D', 'E', 'F']

This code illustrates the types of inputs you can have on the front end: * input: just a simple text input box which users can enter any value they want (if the value specified for "column" is an int or float it will try to convert the string to that data type) and it will be passed to the handler * select: this creates a dropdown populated with the unique values of "column" (an asynchronous dropdown if the column has a large amount of unique values) * multiselect: same as “select” but it will allow you to choose multiple values (handy if you want to perform an isin operation in your filter)

Here is a demo of the functionality: image29

If there are any new types of inputs you would like available please don’t hesitate to submit a request on the “Issues” page of the repo.

Using Swifter

Swifter is a package which will increase performance on any apply() function on a pandas series or dataframe. If install the package in your virtual environment

pip install swifter
# or
pip install dtale[swifter]

It will be used for the following operations: - Standard dataframe formatting in the main grid & chart display - Column Builders - Type Conversions - string hex -> int or float - int or float -> hex - mixed -> boolean - int -> timestamp - date -> int - Similarity Distance Calculation - Handling of empty strings when calculating missing counts - Building unique values by data type in “Describe” popup

Accessing CLI Loaders in Notebook or Console

I am pleased to announce that all CLI loaders will be available within notebooks & consoles. Here are some examples (the last working if you’ve installed dtale[arctic]): - dtale.show_csv(path='test.csv', parse_dates=['date']) - dtale.show_csv(path='http://csv-endpoint', index_col=0) - dtale.show_excel(path='test.xlsx', parse_dates=['date']) - dtale.show_excel(path='test.xls', sheet=) - dtale.show_excel(path='http://excel-endpoint', index_col=0) - dtale.show_json(path='http://json-endpoint', parse_dates=['date']) - dtale.show_json(path='test.json', parse_dates=['date']) - dtale.show_r(path='text.rda') - dtale.show_arctic(host='host', library='library', node='node', start_date='20200101', end_date='20200101')


Once you have kicked off your D-Tale session please copy & paste the link on the last line of output in your browser image30

Dimensions/Ribbon Menu/Main Menu

The information in the upper right-hand corner gives grid dimensions image31 - lower-left => row count - upper-right => column count

Ribbon Menu - hovering around to top of your browser will display a menu items (similar to the ones in the main menu) across the top of the screen - to close the menu simply click outside the menu and/or dropdowns from the menu


Main Menu - clicking the triangle displays the menu of standard functions (click outside menu to close it)


Resize Columns

Currently there are two ways which you can resize columns. * Dragging the right border of the column’s header cell.


  • Altering the “Maximum Column Width” property from the ribbon menu.


  • Side Note: You can also set the max_column_width property ahead of time in your global configuration or programmatically using:
import dtale.global_state as global_state


Editing Cells

You may edit any cells in your grid (with the exception of the row indexes or headers, the ladder can be edited using the Rename column menu function).

In order to edit a cell simply double-click on it. This will convert it into a text-input field and you should see a blinking cursor. In addition to turning that cell into an input it will also display an input at the top of the screen for better viewing of long strings. It is assumed that the value you type in will match the data type of the column you editing. For example:

  • integers -> should be a valid positive or negative integer
  • float -> should be a valid positive or negative float
  • string -> any valid string will do
  • category -> either a pre-existing category or this will create a new category for (so beware!)
  • date, timestamp, timedelta -> should be valid string versions of each
  • boolean -> any string you input will be converted to lowercase and if it equals “true” then it will make the cell True, otherwise False

Users can make use of two protected values as well:

  • “nan” -> numpy.nan
  • “inf” -> numpy.inf

To save your change simply press “Enter” or to cancel your changes press “Esc”.

If there is a conversion issue with the value you have entered it will display a popup with the specific exception in question.

Here’s a quick demo:


Here’s a demo of editing cells with long strings:


Copy Cells Into Clipboard

Select Copy Paste
image41 image42 image43

One request that I have heard time and time again while working on D-Tale is “it would be great to be able to copy a range of cells into excel”. Well here is how that is accomplished: 1) Shift + Click on a cell 2) Shift + Click on another cell (this will trigger a popup) 3) Choose whether you want to include headers in your copy by clicking the checkbox 4) Click Yes 5) Go to your excel workbook and execute Ctrl + V or manually choose “Paste” * You can also paste this into a standard text editor and what you’re left with is tab-delimited data


Want to run D-Tale in a jupyter notebook and build a chart that will still be displayed even after your D-Tale process has shutdown? Now you can! Here’s an example code snippet show how to use it:

import dtale

def test_data():
    import random
    import pandas as pd
    import numpy as np

    df = pd.DataFrame([
        dict(x=i, y=i % 2)
        for i in range(30)
    rand_data = pd.DataFrame(np.random.randn(len(df), 5), columns=['z{}'.format(j) for j in range(5)])
    return pd.concat([df, rand_data], axis=1)

d =
d.offline_chart(chart_type='bar', x='x', y='z3', agg='sum')


Pro Tip: If generating offline charts in jupyter notebooks and you run out of memory please add the following to your command-line when starting jupyter


Disclaimer: Long Running Chart Requests

If you choose to build a chart that requires a lot of computational resources then it will take some time to run. Based on the way Flask & plotly/dash interact this will block you from performing any other request until it completes. There are two courses of action in this situation:

  1. Restart your jupyter notebook kernel or python console
  2. Open a new D-Tale session on a different port than the current session. You can do that with the following command:, port=[any open port], force=True)

If you miss the legacy (non-plotly/dash) charts, not to worry! They are still available from the link in the upper-right corner, but on for a limited time… Here is the documentation for those: Legacy Charts

Your Feedback is Valuable

This is a very powerful feature with many more features that could be offered (linked subplots, different statistical aggregations, etc…) so please submit issues :)

Network Viewer

This tool gives users the ability to visualize directed graphs. For the screenshots I’ll beshowing for this functionality we’ll be working off a dataframe with the following data:


Start by selecting columns containing the “To” and “From” values for the nodes in you network and then click “Load”: image98

You can also see instructions on to interact with the network by expanding the directions section by clicking on the header “Network Viewer” at the top. You can also view details about the network provided by the package networkx by clicking the header “Network Analysis”. image99

Select a column containing weighting for the edges of the nodes in the “Weight” column and click “Load”: image100

Select a column containing group information for each node in the “From” column by populating “Group” and then clicking “Load”: image101

Perform shortest path analysis by doing a Shift+Click on two nodes: image102

View direct descendants of each node by clicking on it: image103

You can zoom in on nodes by double-clicking and zoom back out by pressing “Esc”.


Shows a pearson correlation matrix of all numeric columns against all other numeric columns - By default, it will show a grid of pearson correlations (filtering available by using drop-down see 2nd table of screenshots) - If you have a date-type column, you can click an individual cell and see a timeseries of pearson correlations for that column combination - Currently if you have multiple date-type columns you will have the ability to toggle between them by way of a drop-down - Furthermore, you can click on individual points in the timeseries to view the scatter plot of the points going into that correlation - Within the scatter plot section you can also view the details of the PPS for those data points in the chart by hovering over the number next to “PPS”

Matrix PPS Timeseries Scatter
image104 image105 image106 image107
Col1 Filtered Col2 Filtered Col1 & Col2 Filtered
image108 image109 image110

When the data being viewed in D-Tale has date or timestamp columns but for each date/timestamp vlaue there is only one row of data the behavior of the Correlations popup is a little different - Instead of a timeseries correlation chart the user is given a rolling correlation chart which can have the window (default: 10) altered - The scatter chart will be created when a user clicks on a point in the rollign correlation chart. The data displayed in the scatter will be for the ranges of dates involved in the rolling correlation for that date.

Data Correlations
image111 image112

Predictive Power Score

Predictive Power Score (using the package ppscore) is an asymmetric, data-type-agnostic score that can detect linear or non-linear relationships between two columns. The score ranges from 0 (no predictive power) to 1 (perfect predictive power). It can be used as an alternative to the correlation (matrix). WARNING: This could take a while to load.

This page works similar to the Correlations page but uses the PPS calcuation to populate the grid and by clicking on cells you can view the details of the PPS for those two columns in question.


Heat Map

This will hide any non-float or non-int columns (with the exception of the index on the right) and apply a color to the background of each cell.

  • Each float is renormalized to be a value between 0 and 1.0
  • You have two options for the renormalization
    • By Col: each value is calculated based on the min/max of its column
    • Overall: each value is caluclated by the overall min/max of all the non-hidden float/int columns in the dataset
  • Each renormalized value is passed to a color scale of red(0) - yellow(0.5) - green(1.0) image115

Turn off Heat Map by clicking menu option you previously selected one more time

Highlight Dtypes

This is a quick way to check and see if your data has been categorized correctly. By clicking this menu option it will assign a specific background color to each column of a specific data type.

category timedelta float int date string bool
purple orange green light blue pink white yellow


Highlight Missing

  • Any cells which contain nan values will be highlighted in yellow.
  • Any string column cells which are empty strings or strings consisting only of spaces will be highlighted in orange.
  • ❗will be prepended to any column header which contains missing values.


Highlight Outliers

Highlight any cells for numeric columns which surpass the upper or lower bounds of a custom outlier computation. * Lower bounds outliers will be on a red scale, where the darker reds will be near the maximum value for the column. * Upper bounds outliers will be on a blue scale, where the darker blues will be closer to the minimum value for the column. * ⭐ will be prepended to any column header which contains outliers.


Highlight Range

Highlight any range of numeric cells based on three different criteria: * equals * greater than * less than

You can activate as many of these criteria as you’d like nad they will be treated as an “or” expression. For example, (x == 0) or (x < -1) or (x > 1)

Selections Output
image119 image120

Low Variance Flag

Show flags on column headers where both these conditions are true: * Count of unique values / column size < 10% * Count of most common value / Count of second most common value > 20

Here’s an example of what this will look like when you apply it: image121|image122

Code Exports

Code Exports are small snippets of code representing the current state of the grid you’re viewing including things like: - columns built - filtering - sorting

Other code exports available are: - Describe (Column Analysis) - Correlations (grid, timeseries chart & scatter chart) - Charts built using the Chart Builder


Type Code Export
Main Grid image124
Histogram image125
Describe image126
Correlation Grid image127
Correlation Timeseries image128
Correlation Scatter image129
Charts image130

Export CSV

Export your current data to either a CSV or TSV file:


Load Data & Sample Datasets

So either when starting D-Tale with no pre-loaded data or after you’ve already loaded some data you now have the ability to load data or choose from some sample datasets directly from the GUI:


Here’s the options at you disposal: * Load a CSV/TSV file by dragging a file to the dropzone in the top or select a file by clicking the dropzone * Load a CSV/TSV or JSON directly from the web by entering a URL (also throw in a proxy if you are using one) * Choose from one of our sample datasets: * US COVID-19 data from NY Times (updated daily) * Script breakdowns of popular shows Seinfeld & The Simpsons * Movie dataset containing release date, director, actors, box office, reviews… * Video games and their sales * pandas.util.testing.makeTimeDataFrame


This will give you information about other D-Tale instances are running under your current Python process.

For example, if you ran the following script:

import pandas as pd
import dtale[dict(foo=1, bar=2, biz=3, baz=4, snoopy_D_O_double_gizzle=5)]))[
    dict(a=1, b=2, c=3, d=4),
    dict(a=2, b=3, c=4, d=5),
    dict(a=3, b=4, c=5, d=6),
    dict(a=4, b=5, c=6, d=7)
]))[range(6), range(6), range(6), range(6), range(6), range(6)]), name="foo")

This will make the Instances button available in all 3 of these D-Tale instances. Clicking that button while in the first instance invoked above will give you this popup:


The grid above contains the following information: - Process: timestamp when the process was started along with the name (if specified in - Rows: number of rows - Columns: number of columns - Column Names: comma-separated string of column names (only first 30 characters, hover for full listing) - Preview: this button is available any of the non-current instances. Clicking this will bring up left-most 5X5 grid information for that instance - The row highlighted in green signifys the current D-Tale instance - Any other row can be clicked to switch to that D-Tale instance

Here is an example of clicking the “Preview” button:



This will give you information about what version of D-Tale you’re running as well as if its out of date to whats on PyPi.

Up To Date Out Of Date
image135 image136

Refresh Widths

Mostly a fail-safe in the event that your columns are no longer lining up. Click this and should fix that


Toggle between light & dark themes for your viewing pleasure (only affects grid, not popups or charts).

Light Dark
image137 image138

Reload Data

Force a reload of the data from the server for the current rows being viewing in the grid by clicking this button. This can be helpful when viewing the grid from within another application like jupyter or nested within another website.

Unpin/Pin Menu

If you would like to keep your menu pinned to the side of your grid all times rather than always having to click the triaangle in the upper left-hand corner simply click this button. It is persisted back to the server so that it can be applied to all piece of data you’ve loaded into your session and beyond refreshes.



I am happy to announce that D-Tale now supports both English & Chinese (there is still more of the translation to be completed but the infrastructure is there). And we are happy to add support for any other languages. Please see instruction on how, here.


Pretty self-explanatory, kills your D-Tale session (there is also an auto-kill process that will kill your D-Tale after an hour of inactivity)

Column Menu Functions




These interactive filters come in 3 different types: String, Numeric & Date. Note that you will still have the ability to apply custom filters from the “Filter” popup on the main menu, but it will get applied in addition to any column filters.

Type Filter Data Types Features
String image142 strings & booleans The ability to select multiple values based on what exists in the column. Notice the “Show Missing Only” toggle, this will only show up if your column has nan values
Date image143 dates Specify a range of dates to filter on based on start & end inputs
Numeric image144 ints & floats For integers the “=” will be similar to strings where you can select multiple values based on what exists in the column. You also have access to other operands: <,>,<=,>=,() - “Range exclusve”, [] - “Range inclusive”.

Moving Columns


All column movements are saved on the server so refreshing your browser won’t lose them :ok_hand:

Hiding Columns


All column movements are saved on the server so refreshing your browser won’t lose them :ok_hand:


As simple as it sounds, click this button to delete this column from your dataframe.


Update the name of any column in your dataframe to a name that is not currently in use by your dataframe.



This feature allows users to replace content on their column directly or for safer purposes in a brand new column. Here are the options you have:

Type Data Types Description Menu
Value(s) all Replace specific values in a column with raw values, output from another column or an aggregation on your column image148
Spaces Only strings Replace string values consisting only of spaces with raw values image149
Contains Char/Substring strings Replace string values containing a specific character or substring image150
Scikit-Learn Imputer numeric Replace missing values with the output of using different Scikit-Learn imputers like iterative, knn & simple image151

Here’s a quick demo: image152


Adds your column to “locked” columns - “locked” means that if you scroll horizontally these columns will stay pinned to the right-hand side - this is handy when you want to keep track of which date or security_id you’re looking at - by default, any index columns on the data passed to D-Tale will be locked


Removed column from “locked” columns


Applies/removes sorting (Ascending/Descending/Clear) to the column selected

Important: as you add sorts they sort added will be added to the end of the multi-sort. For example:

Action Sort
click “a”  
sort asc a (asc)
click “b” a (asc)
sort desc a (asc), b(desc)
click “a” a (asc), b(desc)
sort None b(desc)
sort desc b(desc), a(desc)
click “X” on sort display  


Apply simple formats to numeric values in your grid

Type Editing Result
Numeric image153 image154
Date image155 image156
String image157 image158

For all data types you have the ability to change what string is ued for display.

For numbers here’s a grid of all the formats available with -123456.789 as input:

Format Output
Precision (6) -123456.789000
Thousands Sep -123,456.789
Abbreviate -123k
Exponent -1e+5
BPS -1234567890BPS
Red Negatives -123457

For strings you can apply the follwoing formats: * Truncation: truncate long strings to a certain number of characters and replace with an allipses “…” and see the whole value on hover. * Hyperlinks: If your column is comprised of URL strings you can make them hyperlinks which will open a new tab

Describe (Column Analysis)

Based on the data type of a column different charts will be shown. This side panel can be closed using the ‘X’ button in the upper right or by pressing the ESC key.

Chart Data Types Sample
Box Plot Float, Int, Date image159
Histogram Float, Int image160
Value Counts Int, String, Bool, Date, Category image161
Word Value Counts String image162
Category Float image163
Geolocation* Int, Float image164
Q-Q Plot Int, Float, Date image165

Histogram can be displayed in any number of bins (default: 20), simply type a new integer value in the bins input

Value Count by default, show the top 100 values ranked by frequency. If you would like to show the least frequent values simply make your number negative (-10 => 10 least frequent value)

Value Count w/ Ordinal you can also apply an ordinal to your Value Count chart by selecting a column (of type int or float) and applying an aggregation (default: sum) to it (sum, mean, etc…) this column will be grouped by the column you’re analyzing and the value produced by the aggregation will be used to sort your bars and also displayed in a line. Here’s an example:


Word Value Count you can analyze string data by splitting each record by spaces to see the counts of each word. This chart has all the same functions available as “Value Counts”. In addition, you can select multiple “Cleaner” functions to be applied to your column before building word values. These functions will perform operations like removing punctuation, removing numeric character & normalizing accent characters.

Category (Category Breakdown) when viewing float columns you can also see them broken down by a categorical column (string, date, int, etc…). This means that when you select a category column this will then display the frequency of each category in a line as well as bars based on the float column you’re analyzing grouped by that category and computed by your aggregation (default: mean).

Geolocation when your data contains latitude & longitude then you can view the coverage in a plotly scattergeo map. In order to have access this chart your dataframe must have at least one of each of these types of columns: * “lat” must be contained within the lower-cased version of the column name and values be between -90 & 90 * “lon” must be contained within the lower-cased version of the column name and values be between -180 & 180


These are key combinations you can use in place of clicking actual buttons to save a little time:

Keymap Action
shift+m Opens main menu*
shift+d Opens “Describe” page*
shift+f Opens “Custom Filter”*
shift+b Opens “Build Column”*
shift+c Opens “Charts” page*
shift+x Opens “Code Export”*
esc Closes any open modal window or side panel & exits cell editing

* Does not fire if user is actively editing a cell.

For Developers


Clone the code (git clone ssh://, then start the backend server:

$ git clone ssh://
# install the dependencies
$ python develop
# start the server
$ dtale --csv-path /home/jdoe/my_csv.csv --csv-parse_dates date

You can also run dtale from PyDev directly.

You will also want to import javascript dependencies and build the source (all javascript code resides in the frontend folder):

$ cd frontend
$ npm install
# 1) a persistent server that serves the latest JS:
$ npm run watch
# 2) or one-off build:
$ npm run build

Running tests

The usual npm test command works:

$ npm test

You can run individual test files:

$ npm run test -- static/__tests__/dtale/DataViewer-base-test.jsx


You can lint all the JS and CSS to confirm there’s nothing obviously wrong with it:

$ npm run lint

You can also lint individual JS files:

$ npm run lint-js-file -s -- static/dtale/DataViewer.jsx

Formatting JS

You can auto-format code as follows:

$ npm run format

Docker Development

You can build python 27-3 & run D-Tale as follows:

$ yarn run build
$ docker-compose build dtale_2_7
$ docker run -it --network host dtale_2_7:latest
$ python
>>> import pandas as pd
>>> df = pd.DataFrame([dict(a=1,b=2,c=3)])
>>> import dtale

Then view your D-Tale instance in your browser using the link that gets printed

You can build python 36-1 & run D-Tale as follows:

$ yarn run build
$ docker-compose build dtale_3_6
$ docker run -it --network host dtale_3_6:latest
$ python
>>> import pandas as pd
>>> df = pd.DataFrame([dict(a=1,b=2,c=3)])
>>> import dtale

Then view your D-Tale instance in your browser using the link that gets printed

Adding Language Support

Currently D-Tale support both english & chinese but other languages will gladly be supported. To add another language simply open a pull request with the following: - cake a copy & translate the values in the following JSON english JSON files and save them to the same locations as each file - Back-End - Front-End - please make the name of these files the name of the language you are adding (currently english -> en, chinese -> cn) - be sure to keep the keys in english, that is important

Looking forward to what languages come next! :smile:

Global State/Data Storage

If D-Tale is running in an environment with multiple python processes (ex: on a web server running gunicorn) it will most likely encounter issues with inconsistent state. Developers can fix this by configuring the system D-Tale uses for storing data. Detailed documentation is available here: Data Storage and managing Global State

Startup Behavior

Here’s a little background on how the function works: - by default it will look for ports between 40000 & 49000, but you can change that range by specifying the environment variables DTALE_MIN_PORT & DTALE_MAX_PORT - think of sessions as python consoles or jupyter notebooks

  1. Session 1 executes our state is:
Session Port Active Data IDs URL(s)
1 40000 1 http://localhost:40000/dtale/main/1
  1. Session 1 executes our state is:
Session Port Active Data IDs URL(s)
1 40000 1,2 http://localhost:40000/dtale/main/[1,2]
  1. Session 2 executes our state is:
Session Port Active Data IDs URL(s)
1 40000 1,2 http://localhost:40000/dtale/main/[1,2]
2 40001 1 http://localhost:40001/dtale/main/1
  1. Session 1 executes, port=40001, force=True) our state is:
Session Port Active Data IDs URL(s)
1 40001 1,2,3 http://localhost:40001/dtale/main/[1,2,3]
  1. Session 3 executes our state is:
Session Port Active Data IDs URL(s)
1 40001 1,2,3 http://localhost:40001/dtale/main/[1,2,3]
3 40000 1 http://localhost:40000/dtale/main/1
  1. Session 2 executes our state is:
Session Port Active Data IDs URL(s)
1 40001 1,2,3 http://localhost:40001/dtale/main/[1,2,3]
3 40000 1 http://localhost:40000/dtale/main/1
2 40002 1 http://localhost:40002/dtale/main/1
  1. Session 4 executes, port=8080) our state is:
Session Port Active Data IDs URL(s)
1 40001 1,2,3 http://localhost:40001/dtale/main/[1,2,3]
3 40000 1 http://localhost:40000/dtale/main/1
2 40002 1 http://localhost:40002/dtale/main/1
4 8080 1 http://localhost:8080/dtale/main/1
  1. Session 1 executes dtale.get_instance(1).kill() our state is:
Session Port Active Data IDs URL(s)
1 40001 2,3 http://localhost:40001/dtale/main/[2,3]
3 40000 1 http://localhost:40000/dtale/main/1
2 40002 1 http://localhost:40002/dtale/main/1
4 8080 1 http://localhost:8080/dtale/main/1
  1. Session 5 sets DTALE_MIN_RANGE to 30000 and DTALE_MAX_RANGE 39000 and executes our state is:
Session Port Active Data ID(s) URL(s)
1 40001 2,3 http://localhost:40001/dtale/main/[2,3]
3 40000 1 http://localhost:40000/dtale/main/1
2 40002 1 http://localhost:40002/dtale/main/1
4 8080 1 http://localhost:8080/dtale/main/1
5 30000 1 http://localhost:30000/dtale/main/1


Have a look at the detailed documentation.


  • Back-end
    • dash
    • dash_daq
    • Flask
    • Flask-Compress
    • flask-ngrok
    • Pandas
    • plotly
    • scikit-learn
    • scipy
    • xarray
    • arctic [extra]
    • redis [extra]
    • rpy2 [extra]
  • Front-end
    • react-virtualized
    • chart.js


D-Tale has been under active development at Man Numeric since 2019.

Original concept and implementation: Andrew Schonfeld


Contributions welcome!


D-Tale is licensed under the GNU LGPL v2.1. A copy of which is included in LICENSE


2.4.0 (2022-5-8)

  • #665: removed dependency on ppscore and unpinned sklearn

2.3.0 (2022-5-3)

  • Added the ability to export correlations or PPS heatmaps to PNG
  • #653: added “version” entry to dtale module

2.2.0 (2022-3-23)

  • #601: added update_id functionality
  • #649: fixed incorrect property in pivot opertaions

2.1.2 (2022-3-15)

  • #617: file loading on windows
  • #643: correlation grid dropdown display
  • #646: initial show/hide grid display

2.1.0 (2022-3-13)

  • #617: HTML Exports of data grid
  • Added option for JSONL line files in json-loader
  • #643: updated how selected columns get passed to correlation scatter charts
  • #642: updates for merge screen
  • #641: fixed histogram label precision
  • #614: display D-Tale by name
  • #612: fixed bug with replacing strings
  • #602: update any date columns to have naive timezone
  • #607: display of chinese characters in missingno plots
  • #606: stringify tuple column names

2.0.0 (2022-2-20)

  • Typescript conversion of frontend code

1.61.1 (2021-11-17)

  • #600: persist selected chart across columns in describe popup
  • #597: fix for aggregate function on “Summarize Data”

1.61.0 (2021-11-15)

  • replaced querystring package with URLSearchParams
  • #595: probability histograms
  • #589: pareto chart
  • updates for babel ES2020 support

1.60.2 (2021-11-3)

  • #594: fix for editing cells while using redislite

1.60.1 (2021-10-31)

  • updates for “Time Series Analysis” with aggregation

1.60.0 (2021-10-31)

  • #591: load parquet from UI
  • #590: parquet export
  • #533: Time Series Analysis
  • #537: moved “Resample” to the “Dataframe Functions” popup]

1.59.1 (2021-10-15)

  • #583: allow for “vertical_headers” to be set from

1.59.0 (2021-10-15)

  • #581: Binder proxy handling updates
  • #583: vertical column headers
  • front-end package upgrades

1.58.3 (2021-10-4)

  • updated dash-bio to an optional dependency

1.58.2 (2021-10-3)

  • fix for background_mode in

1.58.1 (2021-10-2)

  • re-pinned dash to 2.0.0

1.58.0 (2021-10-2)

  • #568: range highlight updates
  • #566: clustergram charts
  • #578: dataset correlations error
  • #576: dash_core_components and dash_html_component import updates
  • #579: fix for pandas.Series.between FutureWarning
  • #577: specifying backgrounds programmatically

1.57.0 (2021-9-22)

  • #565: allow “chart per group” display in scatter charts
  • #564: geometric mean aggregation in “Summarize Data”
  • #559: lock columns from config, highlight rows, move filters to custom filter, nan display
  • #560: Add “Gage R&R” computation
  • #558: added “Filtered” toggle to “Variance Report”
  • #561: Modify behaviour for finding free port

1.56.0 (2021-8-31)

  • #557: allow filters to be applied to the “Describe” page
  • #555
    • added option to specify default sort in config/show/CLI
    • predefined filter updates
  • #552: added query engine toggle
  • #553: boolean chart axis ticks
  • #554: dash callback input update

1.55.0 (2021-8-17)

  • #553: charts with boolean values as y or z axes
  • #552: exceptions with unsigned integers and NA values
  • #548: updated popups to redirects when in vscode
  • fixed client-side bug with “rename” function

1.54.1 (2021-8-11)

  • #549: fix for grouping charts by multiple columns

1.54.0 (2021-8-6)

  • #545: added “concatenate” & “replace” string column builders
  • updated lodash loading to use tree-shaking
  • #544: fixed issue with loading missingno plots
  • used plotly.js partial distribution to lower egg size

1.53.0 (2021-7-28)

  • updated “Charts” page to handle dark-mode
  • #539: “Substring” & “Split By Character” column builders
  • #542: fixed bug with finding missings in categorical data
  • #543: added “group by” to cumulative sum builder
  • Portuguese translation
  • Fixes for long string tooltips

1.52.0 (2021-7-10)

  • #529: resample timeseries
  • #532: shift and expanding builders
  • #525: bin range on x-axis
  • #526: targeted histogram tooltip
  • updated simpsons dataset to make use of image display

1.51.0 (2021-7-5)

  • #531: re-organizing column builder buttons
  • #530: typo in rolling code snippet
  • #528: feature analysis
  • #534: pinned missingno less than or equal to 0.4.2
  • #523: upgraded to plotly 5
  • Row height resize functionality
  • #522: sorting target values in histogram tooltip

1.50.1 (2021-6-24)

  • #520: additional code export update

1.50.0 (2021-6-23)

  • #515: adding dataframe.index() to chart axis
  • #520: wrong indent in chart code export
  • #519: display raw HTML
  • #518: cumulative sum builder
  • #517: keep less correlated columns
  • #514: targeted histogram fixes
  • #493: Correlations grid sorting
  • #505: Filtering enhancements
  • #484: renamed “Percentage Count” to “Count (Percentage)”
  • #503: add separate option for “Clean Column” to main menu

1.49.0 (2021-6-9)

  • bump css-what from 5.0.0 to 5.0.1
  • added the ability to toggle the display of all columns when heatmap is turned on
  • #491: overlapping histogram chart
  • bump ws from 7.4.5 to 7.4.6
  • Updates
    • #509: resizable side panel width
    • #495: CSV loading dialog
    • height of “Exponential Smoothing” in column builders
    • code snippet fixes
    • cleaner updates

1.48.0 (2021-5-28)

  • #504: fix for toggling between unique row & word values
  • #502: updated “cleaning” column builder to allow for inplace updates
  • #501: updates to describe window labels
  • #500: cleaning “Remove Numbers” code snippet fix
  • #488: string encoding for correlations
  • #484: fixed for percentage count chart aggregation
  • Correlation Scatter Updates:
    • #486: make 15K point limitation correlations scatter an editable setting
    • #487: fix for non-unique column exception in correlation scatter
  • #480: flexible branding
  • #485: Adjustable height on Correlation grid

1.47.0 (2021-5-21)

  • #477: Excel-style cell editing at top of screen
    • UI input for “Maximum Column Width”
  • JS package upgrades
  • refactored how sphinx documentation is built

1.46.0 (2021-5-11)

  • #475: fixes for DtaleRedis issues
  • #140: additional string column filters
  • refactored draggable column resizing to be more performant
  • added dependency on nbformat
  • updated Sphinx documentation building to only run on master builds of python3.9
    • Also pinned jinja2 to 2.11.3 when building

1.45.0 (2021-5-5)

  • #472: maximum column width
  • #471: predefined filters
    • #473: fixed column filters
    • refactored settings (sortInfo, columnFilters, outlierFilters, predefinedFilters) to be stored in redux
    • fixed issues with pinned main menu

1.44.1 (2021-4-27)

  • #470: editing cells for column names with special characters

1.44.0 (2021-4-26)

  • #465: optional authentication
  • #467: fixed column menu issues when name has special characters
  • #466: convert complex data to strings
  • added “head” & “tail” load types for chart data sampling

1.43.0 (2021-4-18)

  • #463: skew & kurtosis on filtered data
  • Moved Correlations & PPS to side panel
  • Added “Show/Hide Columns” side-panel
  • #462: Graphs slow with big data

1.42.1 (2021-4-12)

  • added ESC button handler for closing the side panel

1.42.0 (2021-4-11)

  • Added missingno chart display
  • added new side panel for viewing describe data
    • updated how requirements files are loaded in
    • added cleanup function to instance object
    • added animation for display of hidden/filter/sort info row
  • #306: ribbon menu

1.41.1 (2021-3-30)

  • #458: fix for killing D-Tale sessions in jupyter_server_proxy
  • #378: add cleaning functions to chart inputs

1.41.0 (2021-3-26)

  • #390: funnel charts
  • #255: extended chart aggregations

1.40.2 (2021-3-21)

  • #454: fixed issue with parenthesis & percent symbols in column names

1.40.1 (2021-3-16)

  • hotfix for chart code exports of category column analysis

1.40.0 (2021-3-16)

  • moved “Open In New Tab” button
  • #135: refactored column analysis code and updated code exports to include plotly charts

1.39.0 (2021-3-14)

  • resizable columns
  • updated how click loader options are found
  • Added loader for r datasets (*.rda files)
  • updating the language menu option to list options dynamically

1.38.0 (2021-3-10)

  • #452: handling of column names with periods & spaces as well as long names
  • updated styling of windows to match that of Charts
  • #448: set default value of “ignore_duplicate” to True
  • #442: Dash Updates
    • Split charts by y-axis values if there are multiple
    • Saving charts off and building new ones
    • Toggling which piece of data you’re viewing
    • Toggling language nav menu
  • Instances popup changes
    • updated preview to use DataPreview
    • updated display of “memory usage” to numeral.js

1.37.1 (2021-3-6)

  • Updated to include requirements.txt

1.37.0 (2021-3-5)

  • #445: updated URL paths to handle when D-Tale is running with jupyter server proxy
  • #315: Internationalization (supports english & chinese currently)
  • #441: Add option to ‘pin’ the menu to the screen as a fixed side panel
  • #434
    • updated scatter plot date header to be generated server-side
    • updated scatter plot generation in correlations to use date index rather than date value for filtering
  • update to load dependencies from requirements.txt
  • #437: optional memory usage optimization and show mem usage

1.36.0 (2021-2-18)

  • #428: Turn global_state into interfaces
  • #434: Additional PPS formatting
  • #433: fixed exception message display in merge UI
  • #432: updated calls to “get_instance” in merge code snippets
  • #431: fixed stacking code example
  • #430: replace empty strings with nans when converting dates to timestamp floats

1.35.0 (2021-2-14)

  • #261: Merging & Stacking UI

1.34.0 (2021-2-7)

  • #423: y-axis scale toggle
  • #422: sheet selection on excel uploads
  • #421: replacements not replacing zeroes

1.33.1 (2021-2-1)

  • #420: Added python2.7 support back
  • #416: aggregating charts by “first” or “last”
  • #415: fix display of heatmap option on main menu when column heatap on

1.33.0 (2021-1-31)

  • Excel Uploads
  • Removed python2.7 support from code
  • CI Updates:
    • updated JS workflow to use latest node image
    • dropped support for python 2.7 and added support for python 3.9
  • Jest test refactoring
  • #415: single column heatmap
  • #414: exporting charts using “top_bars”
  • #413: Q-Q Plot
  • #411: updates for column analysis warnings
  • #412: histogram for date columns
  • #404: fixes for group input display on floats and data frequencies

1.32.1 (2021-1-25)

  • #408: modifications to exponential smoothing column builder UI
  • #405: removed cleaners from non-string columns)
  • #404: fixed bug with missing group selection dropdown on strings)
  • #406: handling for duplicate bins

1.32.0 (2021-1-24)

  • #396: added kurtosis to date column descriptions and fixed issue with sequential diffs hanging around for previous columns
  • #397: group type & bin type (frequency/width) options for charts
  • Updated pandas query building to use backticks for extreme column names
  • Node tooltips and URL history building for Network Viewer
  • #399: better titles for groups in charts
  • #393: rolling & exponential smoothing column builders
  • #401: option to show top values in bar charts

1.31.0 (2021-1-16)

  • #387: calculate skew on date columns converted to millisecond integers
  • #386: bugfixes with “Rows w/ numeric” & “Rows w/ hidden”
  • #389: added more precision to KDE values
  • update Network Viewer to allow for URL parameter passing of to, from, group & weight
  • #343: buttons to load sequential diffs for different sorts
  • #376: added bins option to charts for float column groupings
  • #345: geolocation analysis
  • #370: toggle to turn off auto-loading of charts
  • #330: data slope column builder
  • additional documentation

1.30.0 (2021-1-3)

  • fixed dependency issues with 27-3 build and pandas 1.2.0 test failures
  • #379: issue with skew description
  • #346: updated mapbox description
  • #381: Network Analysis sub-page
  • #361: Network Display
  • fixed styling of Dash modals

1.29.1 (2020-12-24)

  • #228: additional documentation on how to run in docker
  • #344: Updates to sorting of unique values as well as display of word value count raw values
  • #374: fixed issue displaying “NaN” string values in chart group options
  • #373: only use group values in mapbox if mapbox group column(s) has been specified
  • #367: rows with hidden characters
  • #372: updated labels for First/Last aggregations and added “Remove Duplicates” option
  • #368: updated “No Aggregation” to be default aggregationfor charts
  • #369: x-axis count wordclouds
  • #366: additional hyphen added to “Replace Hyphens w/ Space” cleaner
  • #365: fixed display issues with KDE

1.29.0 (2020-12-22)

  • #363: show/hide columns on load
  • #348: sub-date map animation fix
  • #347: display items loaded in “Load” slider
  • #349: additional duplicates handling in chart builders
  • node-notifier depdabot alert
  • #351: added KDE to histograms in column analysis
  • package upgrades
  • #350: x-axis column selection no longer required for charts
    • if there is no selection then the default index of (1, 2, …, N) will be used in its place
  • #356: “replace hyphens” cleaner and cleaners added to “Value Counts” analysis
  • #358: addition skew/kurtosis display
  • #357: cleaner for hidden characters
  • #359: repositioned skew/kurt in describe
  • #359: moved “Variance Report” option up in column menu
  • #360: updates to string describe labels
  • fixed issues with draggable/resizable modals

1.28.1 (2020-12-16)

  • updated modals to be resizable (re-resizable)

1.28.0 (2020-12-14)

  • #354: fix for building data ids greater than 10
  • #343: remove nan & nat values from sequential diff analysis
  • #342: column cleaner descriptions
  • #340: add column cleaners to “Word Value Counts” analysis chart
  • #341: NLTK stopword cleaner updates
  • #338: removing nan values from string metrics
  • #334: skew/kurtosis summary
  • Updated modals to be movable (react-draggable)
  • build(deps): bump ini from 1.3.5 to 1.3.7
  • Notify iframe parent of updates

1.27.0 (2020-12-9)

  • fixed bug with bar chart animations
  • #335: addition string metrics for Describe popup
  • #336: sqlite loader
  • #333: sequential diffs in describe popup
  • #332: adding “word counts” to Describe popup]
  • #329: diff() column builder
  • added highlight.js & upgraded react-syntax-highlighter

1.26.0 (2020-12-5)

  • #325: Plotly export chart colors
  • fixed highlight.js dependabot warning
  • #326: trendline with datetime data
  • #327: fixed issues with cleaner deselection
  • #273: Predictive Power Score

1.25.0 (2020-11-30)

  • #323: precision setting for all float columns
  • #265: column cleaners
  • #322: colorscales not being included in chart exports and colorscales added to surface charts
  • #148: random sampling in charts

1.24.0 (2020-11-23)

  • #295: check for swifter when executing apply functions
  • Reworked the display of the “Instances” popup
  • fixed issue with serving static assets when using “app_root”

1.23.0 (2020-11-21)

  • Added better handling for open_browser
  • #319: fix for loading xarray dimensions
  • Added support for embedding D-Tale within Streamlit

1.22.1 (2020-11-15)

  • additional updates to how int/float hex conversions work

1.22.0 (2020-11-14)

  • #317: convert int/float to hexadecimal
  • Copy Columns/Rows to clipboard using Shift+Click & Ctrl+Click
  • Added “items” function to global state mechanisms
  • #296: heatmap doesn’t respect current filters

1.21.1 (2020-11-8)

  • Additional fixes for #313 & #302
    • Handling for partial .ini files
    • Handling for dictionary inputs w/ non-iterable values

1.21.0 (2020-11-6)

  • #313: support for numpy.array, lists & dictionaries
  • #302: configuration file for default options
  • Removal of legacy charting code & updating flask route to plotly dash charts from /charts to /dtale/charts
  • Update to how routes are overriden so it will work with gunicorn
  • Documentation
    • running within gunicorn
    • embedding in another Flask or Django app
    • configuration settings

1.20.0 (2020-11-1)

  • #311: png chart exports and fix for trandlines in exports
  • Added the option to switch grid to “Dark Mode”

1.19.2 (2020-10-25)

  • Documentation updates & better formatting of sample dataset buttons
  • bugfixes for loading empty dtale in a notebook and chart display in embedded app demo

1.19.1 (2020-10-24)

  • Load CSV/TSV/JSON from the web as well as some sample datasets
  • #310: handling for nan in ordinal & label encoders

1.19.0 (2020-10-23)

  • #123: selecting a range of cells to paste into excel
  • Documentation on embedding D-Tale in another Flask app
  • bugfix for altering single y-axis ranges when x-axis is non-numeric
  • #272: encoders for categorical columns

1.18.2 (2020-10-17)

  • #305: Show Duplicates column(s) label
  • #304: Link to Custom Filter from Column Menu
  • #301: Normalized Similarity
  • #289: Show Duplicates query bug & scrollable duplicate groups

1.18.1 (2020-10-16)

  • #299: Value counts not matching top unique values in Column Analysis
  • #298: Standardize column builder bug
  • #297: Similarity bugs
  • #290: show top 5 values with highest frequency in describe details
  • #288: Add Duplicates popup to Column Menu

1.18.0 (2020-10-15)

  • #282: additional exception handling for overriding routes
  • #271: standardized column builder
  • #282: better support for using D-Tale within another Flask application
  • #270: filter outliers from column menu
  • allow users to start D-Tale without loading data
  • #264: similarity column builder
  • #286: column description lag after type conversion

1.17.0 (2020-10-10)

  • #269: column based range highlighting
  • #268: better button labels for inplace vs. new column
  • #283: triple-quote formatting around queries in code exports
  • #266: string concatenation string builder
  • #267: Column discretion UI
  • Fix: Pandas throws error when converting numeric column names to string.

1.16.0 (2020-10-4)

  • #263: word value counts
  • #262: duplicate values
  • #274: URL linkouts

1.15.2 (2020-9-4)

  • hotfix to move HIDE_SHUTDOWN & GITHUB_FORK to dtale module

1.15.1 (2020-9-3)

  • hotfix to expose HIDE_SHUTDOWN & GITHUB_FORK from dtale.global_state

1.15.0 (2020-9-3)

  • #248: Added ‘minPeriods’ & the rolling means (multi-value per date) dateframes for Correlations popup
  • #254: Options to hide shutdown and turn off cell editing
  • #244: Treemap charts

1.14.1 (2020-8-20)

  • #252: Describe shows proper values, but repeats ‘Total Rows:’ heading instead of proper headings

1.14.0 (2020-8-19)

  • #243: column menu descriptions
  • #247: code export compilation error fixes
  • #242: type conversion column menu option & auto-column names on “Build Column”
  • #235: nan formatting

1.13.0 (2020-8-13)

  • #231: “Lock Zoom” button on 3D Scatter & Surface charts for locking camera on animations
  • global & instance-level flag to turn off cell editing
  • added the ability to upload CSVs
  • upgraded prismjs
  • #234: update to line animations so that you can lock axes and highlight last point
  • #233: add candlestick charts
  • #241: total counts vs. count (non-nan) in describe
  • #240: force convert to float
  • #239: converting mixed columns
  • #237: updated “Pivot” reshaper to always using pivot_table
  • #236: “inplace” & “drop_index” parameters for memory optimization and parquet loader
  • #229: added histogram sample chart to bins column builder

1.12.1 (2020-8-5)

  • better axis display on heatmaps
  • handling for column filter data on “mixed” type columns
  • “title” parameter added for offline charts
  • heatmap drilldowns on animations
  • bugfix for refreshing custom geojson charts

1.12.0 (2020-8-1)

  • added better notification for when users view Category breakdowns in “Column Analysis” & “Describe”
  • fixed code snippets in “Numeric” column builder when no operation is selected
  • fixed code exports for transform, winsorixe & z-score normalize column builders
  • added colorscale option to 3D Scatter charts
  • added “Animate By” to Heatmaps
  • initial chart drilldown functionality (histogram, bar)
  • fixed bug with code exports on transform, winsorize & z-score normalize column builders
  • updated labeling & tooltips on histogram charts
  • npm package upgrades

1.11.0 (2020-7-23)

  • updated column filters so that columns with more than 500 unique values are loaded asynchronously as with AsyncSelect
  • added code export to Variance report
  • added z-score normalize column builder

1.10.0 (2020-7-21)

  • #223: import errors in Google Colab
  • #135: added plotly chart construction to code exports
  • #192: Variance Report & flag toggle
  • npm package upgrades
  • added “winsorize” column builder

1.9.2 (2020-7-12)

  • #127: add “Column Analysis” to “Describe”
  • #85: hotkeys

1.9.1 (2020-7-3)

  • #213: Support for koalas dataframes
  • #214: fix for USE_COLAB (colab proxy endpoint injection)

1.9.0 (2020-7-3)

  • added the ability to build columns using transform
  • added USE_COLAB for accessing D-Tale within google colab using their proxy
  • #211: Code export doesnt work on google colab

1.8.19 (2020-6-28)

  • backwards compatibility of ‘colorscale’ URL parameters in charts
  • dropping of NaN locations/groups in choropleth maps

1.8.18 (2020-6-28)

  • #150: replace colorscale dropdown with component from dash-colorscales
  • added the ability to choose been ols & lowess trendlines in scatter charts
  • #83: allow for names to be used in url strings for data_id

1.8.17 (2020-6-18)

  • #151: allow users to load custom topojson into choropleth maps

1.8.16 (2020-6-7)

  • #200: support for xarray

1.8.15 (2020-5-31)

  • #202: maximum recursion errors when using Pyzo IDE

1.8.14 (2020-5-31)

  • #168: updated default colorscale for heatmaps to be Jet
  • #152: added scattermapbox as a valid map type
  • #136: Fill missing values
  • #86: column replacements for values
  • #87: highlight ranges of numeric cells

1.8.13 (2020-5-20)

  • #193: Support for JupyterHub Proxy

1.8.12 (2020-5-15)

  • #196: dataframes that have datatime indexes without a name
  • Added the ability to apply formats to all columns of same dtype

1.8.11 (2020-5-3)

  • #196: improving outlier filter suggestions
  • #190: hide “Animate” inputs when “Percentage Sum” or “Percentage Count” aggregations are used
  • #189: hide “Barsort” when grouping is being applied
  • #187: missing & outlier tooltip descriptions on column headers
  • #186: close “Describe” tab after clicking “Update Grid”
  • #122: editable cells
  • npm package upgrades
  • circleci build script refactoring

1.8.10 (2020-4-26)

  • #184: “nan” not showing up for numeric columns
  • #181: percentage sum/count charts
  • #179: confirmation for column deletion
  • #176: highlight background of outliers/missing values
  • #175: column renaming
  • #174: moved “Describe” popup to new browser tab
  • #173: wider column input box for GroupBy in “Summarize Data” popup
  • #172: allowing groups to be specified in 3D scatter
  • #170: filter “Value” dropdown for maps to only int or float columns
  • #164: show information about missing data in “Describe” popup

1.8.9 (2020-4-18)

  • updated correlations & “Open Popup” to create new tabs instead
  • test fixes for dash 1.11.0
  • added python 3.7 & 3.8 support

1.8.8 (2020-4-9)

  • #144: Changing data type

1.8.7 (2020-4-8)

  • #137: Outliers in the description window
  • #141: Currency Symbole for column Format
  • #156: heat map
  • #160: Option to filter out outliers from charts
  • #161: Syntax error in 1.8.6
  • #162: chart map animation errors with aggrigations
  • #163: Fix scale for animation mode in the chart

1.8.6 [hotfix] (2020-4-5)

  • updates to to include images

1.8.5 [hotfix] (2020-4-5)

  • fixed bug with column calculation for map inputs
  • #149: Icon for Map charts

1.8.4 [hotfix] (2020-4-5)

  • update to to include missing static topojson files
  • #145: Choropleth Map

1.8.3 (2020-4-4)

  • #143: scattergeo map chart UI changes
  • updated offline chart generation of maps to work without loading topojson from the web
  • fix to allow correlations timeseries to handle when date columns jump between rolling & non-rolling
  • added slider to animation and added animation to maps
  • fixes for IE 11 compatibility issues
  • labeling changes for “Reshape” popup
  • added grouping to maps

1.8.2 (2020-4-1)

  • #129: show dtype when hovering over header in “Highlight Dtypes” mode and description tooltips added to main menu
  • made “No Aggregation” the default aggregation in charts
  • bugfix for line charts with more than 15000 points
  • updated “Value Counts” & “Category Breakdown” to return top on initial load
  • #118: added scattergeo & choropleth maps
  • #121: added “not equal” toggle to filters
  • #132: updated resize button to “Refresh Widths”
  • added “Animate” toggle to scatter, line & bar charts
  • #131: changes to “Reshape Data” window
  • #130: updates to pivot reshaper
  • #128: additional hover display of code snippets for column creation
  • #112: updated “Group” selection to give users the ability to select group values

1.8.1 (2020-3-29)

  • #92: column builders for random data
  • #84: highlight columns based on dtype
  • #111: fix for syntax error in charts code export
  • #113: updates to “Value Counts” chart in “Column Analysis” for number of values and ordinal entry
  • #114: export data to CSV/TSV
  • #116: upodated styling for github fork link so “Code Export” is partially clickable
  • #119: fixed bug with queries not being passed to functions
  • #120: fix to allow duplicate x-axis entries in bar charts
  • added “category breakdown” in column analysis popup for float columns
  • fixed bug where previous “show missing only” selection was not being recognized

1.8.0 (2020-3-22)

  • #102: interactive column filtering for string, date, int, float & bool
  • better handling for y-axis management in charts. Now able to toggle between default, single & multi axis
  • increased maximum groups to 30 in charts and updated error messaging when it surpasses that for easier filter creation
  • bugfix for date string width calculation
  • updated sort/filter/hidden header so that you can now click values which will trigger a tooltip for removing individual values
  • updated Filter popup to be opened as separate window when needed

1.7.15 (2020-3-9)

  • #105: better error handling for when JS files are missing
  • #103: pinned Flask to be >= 1.0.0
  • Updated file exporting to no longer use flask.send_file since that doesn’t play nice with WSGI

1.7.14 (2020-3-7)

  • Hotfix for “Reshape” popup when forwarding browser to new data instances

1.7.13 (2020-3-7)

  • New data storage mechanisms available: Redis, Shelve
  • #100: turned off data limits on charts by using WebGL
  • #99: graceful handling of issue calculating min/max information for Describe popup
  • #91: reshaping of data through usage of aggregations, pivots or transposes
  • Export chart to HTML
  • Export chart dat to CSV
  • Offline chart display for use within notebooks
  • Removal of data from the Instances popup
  • Updated styling of charts to fit full window dimensions

1.7.12 (2020-3-1)

  • added syntax highlighting to code exports with react-syntax-highlighting
  • added arctic integration test
  • updated Histogram popup to “Column Analysis” which allows for the following
    • Histograms -> integers and floats
    • Value Counts -> integers, strings & dates

1.7.11 (2020-2-27)

  • hotfix for dash custom.js file missing from production webpack build script

1.7.10 (2020-2-27)

  • #75: added code snippet functionality to the following:
    • main grid, histogram, correlations, column building & charts
  • exposed CLI loaders through the following functions dtale.show_csv, dtale.show_json, dtale.show_arctic
    • build in such a way that it is easy for custom loaders to be exposed as well
  • #82: pinned future package to be >= 0.14.0

1.7.9 (2020-2-24)

  • support for google colab
  • #71: Filter & Formats popups no longer have smooth transition from top of screen
  • #72: Column Menu cutoff on last column of wide dataframes
  • #73: Describe popup does full refresh when clicking rows in dtype grid

1.7.8 (2020-2-22)

  • #77: removal of multiprocessed timeouts

1.7.7 (2020-2-22)

  • centralized global state

1.7.6 (2020-2-21)

  • allowing the usage of context variables within filters
  • #64: handling for loading duplicate data to
  • updated dtale.instances() to print urls rather than show all instances
  • removal of Dash “Export to png” function
  • passing data grid queries to chart page as default
  • added sys.exit() to the thread that manages the reaper

1.7.5 (2020-2-20)

  • hotfix for KeyError loading metadata for columns with min/max information

1.7.4 (2020-2-20)

  • #63: filtering columns with special characters in name
  • added json_loader CLI options
  • updated moving/locking of columns to be persisted to back-end as well as front-end
  • added the ability to show/hide columns
  • #61: added column builder popup

1.7.3 (2020-2-13)

  • added the ability to move columns left or right as well as to the front
  • added formatting capabilities for strings & dates
  • persist formatting settings to popup on reopening
  • bugfix for width-calculation on formatting change

1.7.2 (2020-2-12)

  • 60 timeout handling around chart requests
  • pre-loaded charts through URL search strings
  • pandas query examples in Filter popup

1.7.1 (2020-2-7)

  • added pie, 3D scatter & surface charts
  • updated popups to be displayed when the browser dimensions are too small to host a modal
  • removed Swagger due to its lack up support for updated dependencies

1.7.0 (2020-1-28)

  • redesign of charts popup to use plotly/dash
  • #55: raise exception when data contains duplicate column names
  • heatmap integration
  • combination of “_main.jsx” files into one for spacial optimization
  • #15: made arctic an “extra” dependency

1.6.10 (2020-1-12)

  • better front-end handling of dates for charting as to avoid timezone issues
  • the ability to switch between sorting any axis in bar charts

1.6.9 (2020-1-9)

  • bugfix for timezone issue around passing date filters to server for scatter charts in correlations popup

1.6.8 (2020-1-9)

  • additional information about how to use Correlations popup
  • handling of all-nan data in charts popup
  • styling issues on popups (especially Histogram)
  • removed auto-filtering on correlation popup
  • scatter point color change
  • added chart icon to cell that has been selected in correlation popup
  • responsiveness to scatter charts
  • handling of links to ‘main’,‘iframe’ & ‘popup’ missing data_id
  • handling of ‘inf’ values when getting min/max & describe data
  • added header to window popups (correlations, charts, …) and a link back to the grid
  • added egg building to cirleci script
  • correlation timeseries chart hover line

1.6.7 (2020-1-3)

  • #50: updates to rolling correlation functionality

1.6.6 (2020-1-2)

  • #47: selection of multiple columns for y-axis
  • updated histogram bin selection to be an input box for full customization
  • better display of timestamps in axis ticks for charts
  • sorting of bar charts by y-axis
  • #48: scatter charts in chart builder
  • “nunique” added to list of aggregations
  • turned on “threaded=True” for to avoid hanging popups
  • #45: rolling computations as aggregations
  • Y-Axis editor

1.6.5 (2019-12-29)

  • test whether filters entered will return no data and block the user from apply those
  • allow for group values of type int or float to be displayed in charts popup
  • timeseries correlation values which return ‘nan’ will be replaced by zero for chart purposes
  • update ‘distribution’ to ‘series’ on charts so that missing dates will not show up as ticks
  • added “fork on github” flag for demo version & links to github/docs on “About” popup
  • limited lz4 to <= 2.2.1 in python 27-3 since latest version is no longer supported

1.6.4 (2019-12-26)

  • testing of hostname returned by socket.gethostname, use ‘localhost’ if it fails
  • removal of flask dev server banner when running in production environments
  • better handling of long strings in wordclouds
  • #43: only show timeseries correlations if datetime columns exist with multiple values per date

1.6.3 (2019-12-23)

  • updated versions of packages in yarn.lock due to issue with chart.js box & whisker plots

1.6.2 (2019-12-23)

  • #40: loading initial chart as non-line in chart builder
  • #41: double clicking cells in correlation grid for scatter will cause chart not to display
  • “Open Popup” button for ipython iframes
  • column width resizing on sorting
  • additional int/float descriptors (sum, median, mode, var, sem, skew, kurt)
  • wordcloud chart type

1.6.1 (2019-12-19)

  • bugfix for url display when running from command-line

1.6.0 (2019-12-19)

  • charts integration
    • the ability to look at data in line, bar, stacked bar & pie charts
    • the ability to group & aggregate data within the charts
  • direct ipython iframes to correlations & charts pages with pre-selected inputs
  • the ability to access instances from code by data id dtale.get_instance(data_id)
  • view all active data instances dtale.instances()

1.5.1 (2019-12-12)

  • conversion of new flask instance for each call to serving all data associated with one parent process under the same flask instance unless otherwise specified by the user (the force parameter)

1.5.0 (2019-12-02)

  • ipython integration
    • ipython output cell adjustment
    • column-wise menu support
    • browser window popups for: Correlations, Coverage, Describe, Histogram & Instances

1.4.1 (2019-11-20)

  • #32: unpin jsonschema by moving flasgger to extras_require

1.4.0 (2019-11-19)

  • Correlations Pearson Matrix filters
  • “name” display in title tab
  • “Heat Map” toggle
  • dropped unused “Flask-Caching” requirement

1.3.7 (2019-11-12)

  • Bug fixes for:
    • #28: “Instances” menu option will now be displayed by default
    • #29: add hints to how users can navigate the correlations popup
    • add “unicode” as a string classification for column width calculation

1.3.6 (2019-11-08)

  • Bug fixes for:
    • choose between pandas.corr & numpy.corrcoef depending on presence of NaNs
    • hide timeseries correlations when date columns only contain one day

1.3.5 (2019-11-07)

  • Bug fixes for:
    • duplicate loading of histogram data
    • string serialization failing when mixing future.str & str in scatter function

1.3.4 (2019-11-07)

  • updated correlation calculation to use numpy.corrcoef for performance purposes
  • github rebranding from manahl -> man-group

1.3.3 (2019-11-05)

  • hotfix for failing test under certain versions of future package

1.3.2 (2019-11-05)

  • Bug fixes for:
    • display of histogram column information
    • reload of hidden “processes” input when loading instances data
    • correlations json failures on string conversion

1.3.1 (2019-10-29)

  • fix for incompatible str types when directly altering state of data in running D-Tale instance

1.3.0 (2019-10-29)

  • webbrowser integration (the ability to automatically open a webbrowser upon calling
  • flag for hiding the “Shutdown” button for long-running demos
  • “Instances” navigator popup for viewing all activate D-Tale instances for the current python process

1.2.0 (2019-10-24)

  • #20: fix for data being overriden with each new instance
  • #21: fix for displaying timestamps if they exist
  • calling show() now returns an object which can alter the state of a process
    • accessing/altering state through the data property
    • shutting down a process using the kill() function

1.1.1 (2019-10-23)

  • #13: fix for auto-detection of column widths for strings and floats

1.1.0 (2019-10-08)

  • IE support
  • Describe & About popups
  • Custom CLI support

1.0.0 (2019-09-06)

  • Initial public release

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