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A hack on top of 2to3 for modernizing code for hybrid codebases.

Project description

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python-modernize is a very thin wrapper around lib2to3 to utilize it to make Python 2 code more modern with the intention of eventually porting it over to Python 3. This is an unofficial fork (of that runs on both Python 2 and 3.

It does not guarantee, but it attempts to spit out a Python 2/3 compatible codebase.

Unicode Literal Control:

  • By default modernize will leave literals alone.

  • The --future-unicode flag imports the unicode_literals from the __future__ module. This requires Python 2.6 and later and will require that you mark bytestrings with b'' and native strings in str(b'') or something similar that survives the transformation.


From pip:

$ pip install --upgrade modernize3k


Preview changes on a file or directory:

$ python-modernize

Write the changes:

$ python-modernize --write

Modify doctests rather than normal code:

$ python-modernize --write --doctests


The tests use cram:

$ cram --indent=4 test.cram

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