Python
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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.

It does not guarantee, but it attempts to spit out a Python 2/3 compatible codebase. The code that it generates has a runtime dependency on six.

Unicode Literal Control:

• By default modernize will leave literals alone.
• --six will wrap literals with the six helpers. This is useful if you want to support Python 3.1 and Python 3.2 without bigger changes.
• Alternatively there is the --compat-unicode flag which does not change unicode literals at all which means that you can take advantage of PEP 414.
• The last alternative is the --future-unicode flag which 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 git+https://github.com/myint/python-modernize