Re: Parallel Python x.y.A and x.y.B installations on a single Windows machine

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Date	Mon, 25 Nov 2013 05:20:03 -0800 (PST)
From	Albert-Jan Roskam <fomcl@yahoo.com>
Subject	Re: Parallel Python x.y.A and x.y.B installations on a single Windows machine
To	python-list@python.org, Jurko Gospodnetić <jurko.gospodnetic@pke.hr>
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On Mon, 11/25/13, Jurko Gospodnetić <jurko.gospodnetic@pke.hr> wrote:

Subject: Parallel Python x.y.A and x.y.B installations on a single Windows machine
To: python-list@python.org
Date: Monday, November 25, 2013, 1:32 PM

Hi all.

I was wondering what is the best way to install
multiple Python installations on a single Windows machine.

Regular Windows installer works great as long as all
your installations have a separate major.minor version
identifier. However, if you want to have let's say 2.4.3
& 2.4.4 installed at the same time it does not seem to
work.

I have not been able to find any prepackaged Python
installation or really any solution to this. Most of the
advice seems to boil down to 'do not use such versions
together, use only the latest'.

We would like to run automated tests on one of our
projects (packaged as a Python library) with different
Python versions, and since our code contains workarounds for
several problems with specific Python patch versions, we'd
really like to be able to run the tests with those specific
versions and with as little fuss as possible.

Looking at what the Python installer does, the only
problematic part for working around this manually seems to
be the registry entries under
'Software\Python\PythonCore\M.m' where 'M.n' is the
major.minor version identifier. If Python interpreter
expects to always find its entries there, then I guess there
is no way to do what we need without building customized
Python executables. Is there a way to force a specific
Python interpreter to not read in this information, read it
from an .ini file or something similar?

HI Jurko,

Check out the following packages: virtualenv, virtualenvwrapper, tox
virtualenv + wrapper make it very easy to switch from one python version to another. Stricly speaking you don't need virtualenvwrapper, but it makes working with virtualenv a whole lot easier.Tox also uses virtualenv. You can configure it to sdist your package under different python versions. Also, you can make it run nosetests for each python version and/or implementation (pypy and jython are supported)

Albert-Jan

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Re: Parallel Python x.y.A and x.y.B installations on a single Windows machine Albert-Jan Roskam <fomcl@yahoo.com> - 2013-11-25 05:20 -0800

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