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Python launcher problem

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  Python launcher problem ElChino <elchino@cnn.cn> - 2015-07-30 09:03 +0200
    Re: Python launcher problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-07-30 09:39 +0200
    Re: Python launcher problem Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-30 10:01 +0100
    Re: Python launcher problem Terry Reedy <tjreedy@udel.edu> - 2015-07-30 05:41 -0400
      Re: Python launcher problem wxjmfauth@gmail.com - 2015-07-30 08:05 -0700
    Re: Python launcher problem ElChino <elchino@cnn.cn> - 2015-07-31 18:30 +0200

#94765 — Python launcher problem

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?

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#94766

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?

RTFM.

<http://www.catb.org/~esr/faqs/smart-questions.html>

-- 
PointedEars

Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.

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#94768

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

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#94769

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

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#94777

Le jeudi 30 juillet 2015 11:41:35 UTC+2, Terry Reedy a écrit :
> 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

Are you sure?

C:\Users\triplex>py
'py' n'est pas reconnu en tant que commande interne
ou externe, un programme exécutable ou un fichier de commandes.

C:\Users\triplex>

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#94815

Zachary Ware wrote:

> On Jul 30, 2015 2:05 AM, "ElChino" <elchino@cnn.cn <mailto:elchino@cnn.cn>> 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?
>
> Did you perchance rename the installed 'python.exe' to 'python3.exe'?
> That would be enough to break the launcher.  If you want a 'python3'
> command, you can copy 'python.exe' to 'python3.exe', but 'python.exe'
> needs to remain where it was.

That's what I did:

   ls -l f:/ProgramFiler/Python35/python*.exe
   -rwxr-xr-x 1 XX Administratorer 37664 May 31 04:18 f:/ProgramFiler/Python35/python.exe
   -rwxr-xr-x 1 XX Administratorer 37664 May 31 04:18 f:/ProgramFiler/Python35/python3.exe
   -rwxr-xr-x 1 XX Administratorer 37664 May 31 04:18 f:/ProgramFiler/Python35/pythonw.exe

They all depends on:
  f:\ProgramFiler\Python35\python35.dll

The one and only python35.dll on this box. And also on PATH.

I took Ben Finney's advice to heart. From:
   http://code.activestate.com/lists/python-list/684547/

<quote>
   Calling ‘python’ is now ambiguous, and with Python 2 slipping inexorably
   into the past, increasingly the ‘python’ command is the wrong choice for
   code that we want to survive in the future.

   I am seeing a growing call, with which I agree, to recommend explicitly
   calling ‘python2’ or ‘python3’ as commands.
</quote>

That's why I made that copy; even if some of you find that strange on Windows.
I'll investigate is there's an issue with the Registry later.

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