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From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: Python launcher problem
Date: Thu, 30 Jul 2015 10:01:09 +0100
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On 30/07/2015 08:03, 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?

I get:-

C:\Users\Mark\Documents\MyPython>py -3 -V & python3 -V
Python 3.5.0b4
'python3' is not recognized as an internal or external command,
operable program or batch file.

I've never had a Windows system with a 'python3' on it, so that is 
presumably something you've set up.  Hence it could be a screwed 
registry setting, but you're the only person in a position to find out :)

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence