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From: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
Subject: Re: Make python 3.3 the default one and not 2.7
Date: Wed, 3 Apr 2013 09:43:43 +0000 (UTC)
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Xref: csiph.com comp.lang.python:42649

D. Xenakis <gouzounakis <at> hotmail.com> writes:

> 
> Hi there, i installed python 2.7 (windows 32bit version) from
> http://www.enthought.com/products/epd_free.php and after that i installed
official  3.3 version
> too. So now i got two python folders like this.. c:/Python27 and c:/Python33 . 
> My problem is that when im trying to execute a .py file, the 2.7 version
interpreter launces. In addition if i
> right click and select Edit with IDLE, again version 2.7 interpreter opens.
How can i make python 3.3 the
> default one, as i need this cause i have PyQt4 installed there and so it does
not work with 2.7 .
> Thx in advance.
> 

Check out the post at
http://stackoverflow.com/questions/4664646/how-to-change-default-python-version-on-windows-xp
.
Especially the part about changing the registry. The Python.File entry mentioned
there also has the information about the IDLE version to use.
Best,
Wolfgang