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I have a huge code base which supports Python 2.7.

Now I search a tool which helps me to transform the source code to source code which works on Python 2.7 and Python 3.

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Python comes with a tool called 2to3, which is specifically designed for converting Python 2 to Python 3.

Usually, most of the the converted code works in Python 2.7 as well, in particular after imports from __future__. In this case, most of the incompatabilities can be handled on a per-case basis. In my experience, a main exception from this is Unicode string handling, but if you are dealing with that, you want to get completely rid of Python 2 as quickly as possible anyway.

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  • The result should be code which runs on both: Python2.7 and Python3. – guettli Feb 5 '18 at 11:56
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The futurize script passes Python 2 code through all the appropriate fixers to turn it into valid Python 3 code, and then adds __future__ and future package imports to re-enable compatibility with Python2.

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