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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Python launcher problem
Date: Thu, 30 Jul 2015 05:41:06 -0400
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On 7/30/2015 3:03 AM, ElChino wrote:
> If I in a cmd-shell (actually it is 4NT), do:
>    c:>py -3 -V & python3 -V
>
> I get:
>    Requested Python version (3) not installed  << ! from py -3 -V
>    Python 3.5.0b2   << ! from the 2nd cmd.
>
> What nonsense is this? I DO HAVE Python3 in my %PATH.
> A Registry setting gone haywire?

Start with something that works.
C:\Users\Terry>py -3
Python 3.5.0b2 (v3.5.0b2:7a088af5615b, May 31 2015, 06:22:19) [MSC 
v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> exit()

-- 
Terry Jan Reedy