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From: Edward Diener <eldiener@tropicsoft.invalid>
Newsgroups: comp.lang.python
Subject: Re: Controlling py.exe launcher on Windows
Date: Tue, 05 Aug 2014 18:25:32 -0400
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On 8/5/2014 1:27 PM, Edward Diener wrote:
> I am trying to control the default version of the py.exe launcher on
> Windows. I have the Python 2.7.8 and 3.4.1 installed with both the 32
> bit and 64 bit versions, all in different directories. I assume that .py
> and .pyw files are associated with the py.exe launcher.
>
> I am trying to control which version starts through a py.ini file in the
> same directory as the py.exe file in the 3.4.1 version last installed.
>
> If I specify in the [defaults] section of py.ini:
>
> python=3.4
>
> then launching py.exe will show:
>
> Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:45:13) [MSC v.1600 64
> bit (AM
> D64)] on win32
>
> If I specify:
>
> python=3.4-32
>
> then launching py.exe will show:
>
> Python 2.7.8 (default, Jun 30 2014, 16:08:48) [MSC v.1500 64 bit
> (AMD64)] on win
> 32
>
> Is it really true that I cannot specify the 32 bit version in the .ini
> file or am I doing something wrong here ?

After uninstalling my Python versions and re-installing them, everything 
works properly and I can control the version which py.exe starts from 
the py.ini file.