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Sun Jul 22 15:08:48 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-July/121077.html

On Sun, 22 Jul 2012 11:21:38 +0300, anatoly techtonik <techtonik at gmail.com> wrote:
> http://docs.python.org/py3k/howto/pyporting.html#during-installation
> 
> What's the point in making implicit Python 3 check here:
> try:  # Python 3
>   from distutils.command.build_py import build_py_2to3 as build_py
> except ImportError:  # Python 2
>   from distutils.command.build_py import build_py
> 
> instead of explicit check like:
> import sys
> if sys.version_info[0] >= 3:
>     from distutils.command.build_py import build_py_2to3 as build_py

It's called testing for the thing that actually matters, rather than
testing a constant with a much broader meaning.  Yes, in this case the
results are the same, but IMO it is better programming practice to test
the thing that actually matters when you can.

--David

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[Python-Dev] 2to3 porting HOWTO: setup.py question