Ecosyste.ms: Awesome
An open API service indexing awesome lists of open source software.
https://github.com/anntzer/defopt
Effortless argument parser
https://github.com/anntzer/defopt
cli
Last synced: 17 days ago
JSON representation
Effortless argument parser
- Host: GitHub
- URL: https://github.com/anntzer/defopt
- Owner: anntzer
- License: mit
- Created: 2016-02-06T14:44:50.000Z (almost 9 years ago)
- Default Branch: main
- Last Pushed: 2024-03-24T19:25:40.000Z (8 months ago)
- Last Synced: 2024-03-29T17:32:32.517Z (8 months ago)
- Topics: cli
- Language: Python
- Homepage: https://pypi.org/project/defopt/
- Size: 500 KB
- Stars: 208
- Watchers: 9
- Forks: 12
- Open Issues: 8
-
Metadata Files:
- Readme: README.rst
- Changelog: CHANGELOG.rst
- License: LICENSE.txt
Awesome Lists containing this project
README
defopt
======
| |GitHub| |PyPI| |conda-forge|
| |Read the Docs| |Build|
.. |GitHub|
image:: https://img.shields.io/badge/github-anntzer%2Fdefopt-brightgreen
:target: `GitHub repository`_
.. |PyPI|
image:: https://img.shields.io/pypi/v/defopt.svg?color=brightgreen
:target: https://pypi.org/project/defopt
.. |conda-forge|
image:: https://img.shields.io/conda/v/conda-forge/defopt.svg?label=conda-forge&color=brightgreen
:target: https://anaconda.org/conda-forge/defopt
.. |Read the Docs|
image:: https://img.shields.io/readthedocs/defopt
:target: `Read the Docs`_
.. |Build|
image:: https://img.shields.io/github/actions/workflow/status/anntzer/defopt/build.yml?branch=main
:target: https://github.com/anntzer/defopt/actions
defopt is a lightweight, no-effort argument parser.
defopt will:
- Allow functions to be run from code and the command line without modification.
- Reward you for documenting your functions.
- Save you from writing, testing and maintaining argument parsing code.
defopt will not:
- Modify your functions in any way.
- Allow you to build highly complex or customized command line tools.
If you want total control over how your command line looks or behaves, try
docopt_, click_ or argh_. If you just want to write Python code and leave the
command line interface up to someone else, defopt is for you.
Usage
-----
Once you have written and documented_ your function, simply pass it to
`defopt.run()` and you're done.
.. code-block:: python
import defopt
# Use type hints:
def main(greeting: str, *, count: int = 1):
"""
Display a friendly greeting.
:param greeting: Greeting to display
:param count: Number of times to display the greeting
"""
for _ in range(count):
print(greeting)
# ... or document parameter types in the docstring:
def main(greeting, *, count=1):
"""
Display a friendly greeting.
:param str greeting: Greeting to display
:param int count: Number of times to display the greeting
"""
for _ in range(count):
print(greeting)
if __name__ == '__main__':
defopt.run(main)
Descriptions of the parameters and the function itself are used to build an
informative help message.
::
$ python test.py -h
usage: test.py [-h] [-c COUNT] greeting
Display a friendly greeting.
positional arguments:
greeting Greeting to display
optional arguments:
-h, --help show this help message and exit
-c COUNT, --count COUNT
Number of times to display the greeting
(default: 1)
Your function can now be called identically from Python and the command line.
::
>>> from test import main
>>> main('hello!', count=2)
hello!
hello!
::
$ python test.py hello! --count 2
hello!
hello!
Philosopy
---------
defopt was developed with the following guiding principles in mind:
#. **The interface can be fully understood in seconds.** If it took any longer,
your time would be better spent learning a more flexible tool.
#. **Anything you learn applies to the existing ecosystem.** The exact same
docstrings used by defopt are also used by Sphinx's autodoc_ extension to
generate documentation, and by your IDE to do type checking. Chances are you
already know everything you need to know to use defopt.
#. **Everything is handled for you.** If you're using defopt, it's because you
don't want to write any argument parsing code *at all*. You can trust it to
build a logically consistent command line interface to your functions
with no configuration required.
#. **Your Python functions are never modified.** Type conversions are only ever
applied to data originating from the command line. When used in code,
duck-typing still works exactly as you expect with no surprises.
Development
-----------
For source code, examples, questions, feature requests and bug reports, visit
the `GitHub repository`_.
Documentation
-------------
Documentation is hosted on `Read the Docs`_.
.. _GitHub repository: https://github.com/anntzer/defopt
.. _Read the Docs: https://defopt.readthedocs.io/en/latest/
.. _autodoc: https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html
.. _docopt: http://docopt.org/
.. _click: https://click.palletsprojects.com/
.. _argh: https://argh.readthedocs.io/en/latest/
.. _documented: https://defopt.readthedocs.io/en/latest/examples.html#docstring-styles
.. This document is included in docs/index.rst; table of contents appears here.