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A lightweight console printing and formatting toolkit

Project description

wasabi: A lightweight console printing and formatting toolkit

Over the years, I've written countless implementations of coloring and formatting utilities to output messages in our libraries like spaCy, Thinc and Prodigy. While there are many other great open-source options, I've always ended up wanting something slightly different or slightly custom.

This package is still a work in progress and aims to bundle those utilities in a standardised way so they can be shared across our other projects. It's super lightweight, has zero dependencies and works across Python 2 and 3.

Azure Pipelines PyPi conda GitHub Code style: black

💬 FAQ

Are you going to add more features?

Yes, there's still a few of helpers and features to port over. However, the new features will be heavily biased by what we (think we) need. I always appreciate pull requests to improve the existing functionality – but I want to keep this library as simple, lightweight and specific as possible.

Can I use this for my projects?

Sure, if you like it, feel free to adopt it! Just keep in mind that the package is very specific and not intended to be a full-featured and fully customisable formatting library. If that's what you're looking for, you might want to try other packages – for example, colored, crayons, colorful, tabulate, console or py-term, to name a few.

Why wasabi?

I was looking for a short and descriptive name, but everything was already taken. So I ended up naming this package after one of my rats, Wasabi. 🐀

⌛️ Installation

pip install wasabi

🎛 API

function msg

An instance of Printer, initialized with the default config. Useful as a quick shortcut if you don't need to customize initialization.

from wasabi import msg

msg.good("Success!")

class Printer

method Printer.__init__

from wasabi import Printer

msg = Printer()
Argument Type Description Default
pretty bool Pretty-print output with colors and icons. True
no_print bool Don't actually print, just return. False
colors dict Add or overwrite color values, names mapped to 0-256. None
icons dict Add or overwrite icon. Name mapped to unicode. None
line_max int Maximum line length (for divider). 80
animation unicode Steps of loading animation for Printer.loading. "⠙⠹⠸⠼⠴⠦⠧⠇⠏"
animation_ascii unicode Alternative animation for ASCII terminals. "|/-\\"
hide_animation bool Don't display animation, e.g. for logs. False
ignore_warnings bool Don't output messages of type MESSAGE.WARN. False
env_prefix unicode Prefix for environment variables, e.g. WASABI_LOG_FRIENDLY. "WASABI"
RETURNS Printer The initialized printer. -

method Printer.text

msg = Printer()
msg.text("Hello world!")
Argument Type Description Default
title unicode The main text to print. ""
text unicode Optional additional text to print. ""
color  unicode / int Color name or value. None
icon unicode Name of icon to add. None
show bool Whether to print or not. Can be used to only output messages under certain condition, e.g. if --verbose flag is set. True
no_print bool Don't actually print, just return. Overwrites global setting. False
exits int If set, perform a system exit with the given code after printing. None

method Printer.good, Printer.fail, Printer.warn, Printer.info

Print special formatted messages.

msg = Printer()
msg.good("Success")
msg.fail("Error")
msg.warn("Warning")
msg.info("Info")
Argument Type Description Default
title unicode The main text to print. ""
text unicode Optional additional text to print. ""
show bool Whether to print or not. Can be used to only output messages under certain condition, e.g. if --verbose flag is set. True
exits int If set, perform a system exit with the given code after printing. None

method Printer.divider

Print a formatted divider.

msg = Printer()
msg.divider("Heading")
Argument Type Description Default
text unicode Headline text. If empty, only the line is printed. ""
char unicode Single line character to repeat. "="
show bool Whether to print or not. Can be used to only output messages under certain condition, e.g. if --verbose flag is set. True

contextmanager Printer.loading

msg = Printer()
with msg.loading("Loading..."):
    # Do something here that takes longer
    time.sleep(10)
msg.good("Successfully loaded something!")
Argument Type Description Default
text unicode The text to display while loading. ""

method Printer.table, Printer.row

See Tables.

property Printer.counts

Get the counts of how often the special printers were fired, e.g. MESSAGES.GOOD. Can be used to print an overview like "X warnings"

msg = Printer()
msg.good("Success")
msg.fail("Error")
msg.warn("Error")

print(msg.counts)
# Counter({'good': 1, 'fail': 2, 'warn': 0, 'info': 0})
Argument Type Description
RETURNS Counter The counts for the individual special message types.

Tables

function table

Lightweight helper to format tabular data.

from wasabi import table

data = [("a1", "a2", "a3"), ("b1", "b2", "b3")]
header = ("Column 1", "Column 2", "Column 3")
widths = (8, 9, 10)
aligns = ("r", "c", "l")
formatted = table(data, header=header, divider=True, widths=widths, aligns=aligns)
Column 1   Column 2    Column 3
--------   ---------   ----------
      a1      a2       a3
      b1      b2       b3
Argument Type Description Default
data iterable / dict The data to render. Either a list of lists (one per row) or a dict for two-column tables.
header iterable Optional header columns. None
footer iterable Optional footer columns. None
divider bool Show a divider line between header/footer and body. False
widths iterable / "auto" Column widths in order. If "auto", widths will be calculated automatically based on the largest value. "auto"
max_col int Maximum column width. 30
spacing int Number of spaces between columns. 3
aligns iterable / unicode Columns alignments in order. "l" (left, default), "r" (right) or "c" (center). If If a string, value is used for all columns. None
multiline bool If a cell value is a list of a tuple, render it on multiple lines, with one value per line. False
RETURNS unicode The formatted table.

function row

from wasabi import row

data = ("a1", "a2", "a3")
formatted = row(data)
a1   a2   a3
Argument Type Description Default
data iterable The individual columns to format.
widths iterable / int / "auto" Column widths, either one integer for all columns or an iterable of values. If "auto", widths will be calculated automatically based on the largest value. "auto"
spacing int Number of spaces between columns. 3
aligns iterable Columns alignments in order. "l" (left), "r" (right) or "c" (center). None
RETURNS unicode The formatted row.

class TracebackPrinter

Helper to output custom formatted tracebacks and error messages. Currently used in Thinc.

method TracebackPrinter.__init__

Initialize a traceback printer.

from wasabi import TracebackPrinter

tb = TracebackPrinter(tb_base="thinc", tb_exclude=("check.py",))
Argument Type Description Default
color_error unicode / int Color name or code for errors (passed to color helper). "red"
color_tb unicode / int Color name or code for traceback headline (passed to color helper). "blue"
color_highlight unicode / int Color name or code for highlighted text (passed to color helper). "yellow"
indent int Number of spaces to use for indentation. 2
tb_base unicode Name of directory to use to show relative paths. For example, "thinc" will look for the last occurence of "/thinc/" in a path and only show path to the right of it. None
tb_exclude tuple List of filenames to exclude from traceback. tuple()
RETURNS TracebackPrinter The traceback printer.

method TracebackPrinter.__call__

Output custom formatted tracebacks and errors.

from wasabi import TracebackPrinter
import traceback

tb = TracebackPrinter(tb_base="thinc", tb_exclude=("check.py",))

error = tb("Some error", "Error description", highlight="kwargs", tb=traceback.extract_stack())
raise ValueError(error)
  Some error
  Some error description

  Traceback:
  ├─ <lambda> [61] in .env/lib/python3.6/site-packages/pluggy/manager.py
  ├─── _multicall [187] in .env/lib/python3.6/site-packages/pluggy/callers.py
  └───── pytest_fixture_setup [969] in .env/lib/python3.6/site-packages/_pytest/fixtures.py
         >>> result = call_fixture_func(fixturefunc, request, kwargs)
Argument Type Description Default
title unicode The message title.
*texts unicode Optional texts to print (one per line).
highlight unicode Optional sequence to highlight in the traceback, e.g. the bad value that caused the error. False
tb iterable The traceback, e.g. generated by traceback.extract_stack(). None
RETURNS unicode The formatted traceback. Can be printed or raised by custom exception.

Utilities

function color

from wasabi import color

formatted = color("This is a text", fg="white", bg="green", bold=True)
Argument Type Description Default
text unicode The text to be formatted. -
fg unicode / int Foreground color. String name or 0 - 256. None
bg unicode / int Background color. String name or 0 - 256. None
bold bool Format the text in bold. False
RETURNS unicode The formatted string.

function wrap

from wasabi import wrap

wrapped = wrap("Hello world, this is a text.", indent=2)
Argument Type Description Default
text unicode The text to wrap. -
wrap_max int Maximum line width, including indentation. 80
indent int Number of spaces used for indentation. 4
RETURNS unicode The wrapped text with line breaks.

function diff_strings

from wasabi import diff_strings

diff = diff_strings("hello world!", "helloo world")
Argument Type Description Default
a unicode The first string to diff.
b unicode The second string to diff.
fg unicode / int Foreground color. String name or 0 - 256. "black"
bg tuple Background colors as (insert, delete) tuple of string name or 0 - 256. ("green", "red")
RETURNS unicode The formatted diff.

Environment variables

Wasabi also respects the following environment variables. The prefix can be customised on the Printer via the env_prefix argument. For example, setting env_prefix="SPACY" will expect the environment variable SPACY_LOG_FRIENDLY.

Name Description
ANSI_COLORS_DISABLED Disable colors.
WASABI_LOG_FRIENDLY Make output nicer for logs (no colors, no animations).
WASABI_NO_PRETTY Disable pretty printing, e.g. colors and icons.

🔔 Run tests

Fork or clone the repo, make sure you have pytest installed and then run it on the package directory. The tests are located in /wasabi/tests.

pip install pytest
cd wasabi
python -m pytest wasabi

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