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A django middleware that provides one application programming interface to read and write data in different excel file formats

Project Description

Known constraints

Fonts, colors and charts are not supported.

Here is a typical conversation between the developer and the user:

User: "I have uploaded an excel file"
      "but your application says un-supported file format"
Developer: "Did you upload an xlsx file or a csv file?"
User: "Well, I am not sure. I saved the data using "
      "Microsoft Excel. Surely, it must be in an excel format."
Developer: "OK. Here is the thing. I were not told to support"
           "all available excel formats in day 1. Live with it"
           "or delay the project x number of days."

django-excel is based on pyexcel and makes it easy to consume/produce information stored in excel files over HTTP protocol as well as on file system. This library can turn the excel data into a list of lists, a list of records(dictionaries), dictionaries of lists. And vice versa. Hence it lets you focus on data in Django based web development, instead of file formats.

The idea originated from the common usability problem when developing an excel file driven web applications for non-technical office workers: such as office assistant, human resource administrator. The fact is that not all people know the difference among various excel formats: csv, xls, xlsx. Instead of training those people about file formats, this library helps web developers to handle most of the excel file formats by providing a common programming interface. To add a specific excel file format to you application, all you need is to install an extra pyexcel plugin. No code change to your application. Looking at the community, this library and its associated ones try to become a small and easy to install alternative to Pandas.

The highlighted features are:

  1. excel data import into and export from databases
  2. turn uploaded excel file directly into Python data structure
  3. pass Python data structures as an excel file download
  4. provide data persistence as an excel file in server side
  5. supports csv, tsv, csvz, tsvz by default and other formats are supported via the following plugins:
<caption>A list of file formats supported by external plugins</caption>
Package name Supported file formats Dependencies Python versions
pyexcel-io csv, csvz [1], tsv, tsvz [2]   2.6, 2.7, 3.3, 3.4, 3.5, 3.6 pypy
pyexcel-xls xls, xlsx(read only), xlsm(read only) xlrd, xlwt same as above
pyexcel-xlsx xlsx openpyxl same as above
pyexcel-xlsxw xlsx(write only) XlsxWriter same as above
pyexcel-ods3 ods ezodf, lxml 2.6, 2.7, 3.3, 3.4 3.5, 3.6
pyexcel-ods ods odfpy same as above
pyexcel-odsr ods(read only) lxml same as above
pyexcel-text (write only)json, rst, mediawiki, html, latex, grid, pipe, orgtbl, plain simple tabulate 2.6, 2.7, 3.3, 3.4 3.5, 3.6, pypy
pyexcel-handsontable handsontable in html handsontable same as above
pyexcel-pygal svg chart pygal 2.7, 3.3, 3.4, 3.5 3.6, pypy

In order to manage the list of plugins installed, you need to use pip to add or remove a plugin. When you use virtualenv, you can have different plugins per virtual environment. In the situation where you have multiple plugins that does the same thing in your environment, you need to tell pyexcel which plugin to use per function call. For example, pyexcel-ods and pyexcel-odsr, and you want to get_array to use pyexcel-odsr. You need to append get_array(…, library=’pyexcel-odsr’).

Footnotes

[1]zipped csv file
[2]zipped tsv file

This library makes information processing involving various excel files as easy as processing array, dictionary when processing file upload/download, data import into and export from SQL databases, information analysis and persistence. It uses pyexcel and its plugins:

  1. to provide one uniform programming interface to handle csv, tsv, xls, xlsx, xlsm and ods formats.
  2. to provide one-stop utility to import the data in uploaded file into a database and to export tables in a database as excel files for file download.
  3. to provide the same interface for information persistence at server side: saving a uploaded excel file to and loading a saved excel file from file system.

Tested Django Versions

Installation

You can install it via pip:

$ pip install django-excel

or clone it and install it:

$ git clone https://github.com/pyexcel/django-excel.git
$ cd django-excel
$ python setup.py install

Setup

You will need to update your settings.py:

FILE_UPLOAD_HANDLERS = ("django_excel.ExcelMemoryFileUploadHandler",
                        "django_excel.TemporaryExcelFileUploadHandler")

Usage

Here is the example viewing function codes:

from django.shortcuts import render_to_response
from django.http import HttpResponseBadRequest
from django import forms
from django.template import RequestContext
import django_excel as excel

class UploadFileForm(forms.Form):
    file = forms.FileField()

def upload(request):
    if request.method == "POST":
        form = UploadFileForm(request.POST, request.FILES)
        if form.is_valid():
            filehandle = request.FILES['file']
            return excel.make_response(filehandle.get_sheet(), "csv")
        else:
            return HttpResponseBadRequest()
    else:
        form = UploadFileForm()
    return render_to_response('upload_form.html',
                              {'form': form},
                              context_instance=RequestContext(request))

def download(request):
    sheet = excel.pe.Sheet([[1, 2],[3, 4]])
    return excel.make_response(sheet, "csv")

Support the project

If your company has embedded pyexcel and its components into a revenue generating product, please support me on patreon to maintain the project and develop it further.

If you are an individual, you are welcome to support me too on patreon and for however long you feel like to. As a patreon, you will receive early access to pyexcel related contents.

With your financial support, I will be able to invest a little bit more time in coding, documentation and writing interesting posts.

Development guide

Development steps for code changes

  1. git clone https://github.com/pyexcel/django-excel.git
  2. cd django-excel

Upgrade your setup tools and pip. They are needed for development and testing only:

  1. pip install –upgrade setuptools pip

Then install relevant development requirements:

  1. pip install -r rnd_requirements.txt # if such a file exists
  2. pip install -r requirements.txt
  3. pip install -r tests/requirements.txt

Once you have finished your changes, please provide test case(s), relevant documentation and update CHANGELOG.rst.

Note

As to rnd_requirements.txt, usually, it is created when a dependent
library is not released. Once the dependecy is installed (will be released), the future version of the dependency in the requirements.txt will be valid.

How to test your contribution

Although nose and doctest are both used in code testing, it is adviable that unit tests are put in tests. doctest is incorporated only to make sure the code examples in documentation remain valid across different development releases.

On Linux/Unix systems, please launch your tests like this:

$ make

On Windows systems, please issue this command:

> test.bat

How to update test environment and update documentation

Additional steps are required:

  1. pip install moban
  2. git clone https://github.com/pyexcel/pyexcel-commons.git commons
  3. make your changes in .moban.d directory, then issue command moban

What is pyexcel-commons

Many information that are shared across pyexcel projects, such as: this developer guide, license info, etc. are stored in pyexcel-commons project.

What is .moban.d

.moban.d stores the specific meta data for the library.

Acceptance criteria

  1. Has Test cases written
  2. Has all code lines tested
  3. Passes all Travis CI builds
  4. Has fair amount of documentation if your change is complex
  5. Agree on NEW BSD License for your contribution

License

New BSD License

Change log

0.0.9 - 12.07.2017

Added

  1. bring isave_to_database and isave_book_to_database

0.0.8 - 07.07.2017

Added

  1. issue 39, explicitly seeking at 0

0.0.7 - 29.06.2017

Added

  1. issue 38, Support unicode code as download file name

0.0.6 - 12.22.2016

Updated

  1. issue 26, raise ioerror if content is empty.
  2. Use pyexcel-webio v0.0.9 so as to push out new version of pyexcel and its plugins.

0.0.5 - 26.08.2016

Added:

  1. Support for django 1.6.x
  2. Tested against django 1.10
Release History

Release History

This version
History Node

0.0.9

History Node

0.0.8

History Node

0.0.7

History Node

0.0.6

History Node

0.0.5

History Node

0.0.4

History Node

0.0.3

History Node

0.0.2

History Node

0.0.1

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
django_excel-0.0.9-py2.py3-none-any.whl (18.7 kB) Copy SHA256 Checksum SHA256 2.7 Wheel Jul 12, 2017
django-excel-0.0.9.tar.gz (9.6 kB) Copy SHA256 Checksum SHA256 Source Jul 12, 2017

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