2to3

[andrea crotti]

What would be an almost automated way to develop for both python 2.x and
3.x?

2to3 apparently can only output a diff or write directly on the file (with
-w), but why doesn't it output the resulting file for 3.x instead?

So for a single python file I tried a makefile like:

Makefile:
all: empathy.py
    cp empathy.py empathy3.py
    2to3 -w empathy3.py

But maybe there's a better way using python tools...

Then after that how do I test the various versions with the various python
versions in a portable way?

I could just have a bash script that calls

python2 empathy.py
python3 empathy3.py

but it's probably not very portable..
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