Access an specific python version in a system with more than one python environment

Question

I am trying to access python 3.4 from the terminal under windows 7. I have installed Python through Anaconda distribution and with it I installed python 2.7 by default and python 3.4 in a virtual environment.

when I run this:

c:\Anaconda\envs\Python34\Python.exe setup.py

I get:

usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: setup.py --help [cmd1 cmd2 ...]
   or: setup.py --help-commands
   or: setup.py cmd --help

error: no commands supplied

So how can I call python 3.4 from the terminal?

Thanks in advance.

You just ran python 3.4 there? That message is coming from setup.py — Eric
– Eric, Commented Jul 20, 2015 at 7:55
Please explain what the problem with what you already did is. — Eric
– Eric, Commented Jul 20, 2015 at 8:03

Duncan · Accepted Answer · 2015-07-20 07:57:58Z

1

Make the first line of myscript.py a hashbang:

#!c:\Anaconda\envs\Python34\Python.exe

If you only have a single Python 3.x interpreter installed then the hashbang can be simpler:

#!python3

Then run the script with py:

C:\> py myscript.py

or just:

C:\> myscript.py

answered Jul 20, 2015 at 7:57

Duncan

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1 Comment

Santi Peñate-Vera Over a year ago

same here, I get : 'py' is not recognized as an internal or external command

Duncan · Accepted Answer · 2015-07-20 08:09:27Z

0

Python for windows ships with a launcher that managed multiple versions:

py -2 my2script.py
py -3 my3script.py
py -3.4 mynew3script.py

edited Jul 20, 2015 at 8:09

Duncan

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answered Jul 20, 2015 at 7:57

Eric

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7 Comments

Santi Peñate-Vera Over a year ago

I get : 'py' is not recognized as an internal or external command

Eric Over a year ago

Then it's not on your path.

Duncan Over a year ago

@SantiPeñate-Vera, it gets installed into C:\windows when you install Python 3.x. Did you install from a standard distribution?

Santi Peñate-Vera Over a year ago

Might be, so, shall I add 'c:\Anaconda\envs\Python34\Python.exe' to the system path?

Santi Peñate-Vera Over a year ago

@Duncan I installed python 2.7 from anaconda distribution and later added python 3.4 as a virtual environment.

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