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.. image:: https://img.shields.io/coveralls/github/PyCQA/modernize?label=coveralls&logo=coveralls
    :alt: Coveralls
    :target: https://coveralls.io/github/PyCQA/modernize
.. image:: https://img.shields.io/readthedocs/modernize?logo=read-the-docs
    :alt: Read the Docs
    :target: https://modernize.readthedocs.io/en/latest/
.. image:: https://img.shields.io/github/workflow/status/PyCQA/modernize/CI?label=GitHub%20Actions&logo=github
    :alt: GitHub Actions
    :target: https://github.com/PyCQA/modernize
.. image:: https://img.shields.io/pypi/v/modernize?logo=pypi
    :alt: PyPI
    :target: https://pypi.org/project/modernize/

Modernize is a Python program that reads Python 2 source code
and applies a series of fixers to transform it into source code
that is valid on both Python 3 and Python 2.7.

This allows you to run your test suite on Python 2.7 and Python 3
so you can gradually port your code to being fully Python 3
compatible without slowing down development of your Python 2
project.

The ``python -m modernize`` command works like
``python -m fissix``, see `fissix <https://github.com/jreese/fissix>`_.
Here's how you'd rewrite a
single file::

    python -m modernize -w example.py

It does not guarantee, but it attempts to spit out a codebase compatible
with Python 2.6+ or Python 3. The code that it generates has a runtime
dependency on `six <https://pypi.python.org/pypi/six>`_, unless the
``--no-six`` option is used. Version 1.9.0 or later of ``six`` is
recommended. Some of the fixers output code that is not compatible with
Python 2.5 or lower.

Once your project is ready to run in production on Python 3 it's
recommended to drop Python 2.7 support using
`pyupgrade <https://pypi.org/project/pyupgrade/>`_

**Documentation:** `modernize.readthedocs.io
<https://modernize.readthedocs.io/>`_.

See the ``LICENSE`` file for the license of ``modernize``.
Using this tool does not affect licensing of the modernized code.

This library is a very thin wrapper around `fissix
<https://github.com/jreese/fissix>`_, a fork of lib2to3.