[Python] Start Python from Windows PowerShell

I know this looks like a question answered thousands of time, but none of the traditional answers concerning the environment PATH are working.

I want to run the following in Windows 7, in Powershell:

python mycode.py


However, Powershell returns an error, stating that python not recognized as an applet, function, application,...

These are my path variables:

Users variables:

PATH
C:\Python27\Lib\site-packages\PyQt4;
C:\Python27;
C:\Python27\DLLs;
C:\Python27\Scripts;
C:\Python27\Lib\site-packages\vtk;
C:\Python27\gnuplot\binary;
C:\Program Files (x86)\pythonxy\SciTE-3.3.2-3;
C:\Program Files (x86)\pythonxy\console;
C:\MinGW32-xy\bin;
C:\Program Files (x86)\pythonxy\swig;
C:\Program Files (x86)\pythonxy\gettext\bin

PATHEXT
.PY;.PYW

PYTHON_INCLUDE
C:\Python27\include

PYTHON_LIB
C:\Python27\libs\python27.lib


and System variables:

PATH
C:\Python27\Lib\site-packages\PyQt4;
C:\Python27;
C:\Python27\DLLs;
C:\Python27\Scripts;
C:\Python27\Lib\site-packages\vtk;
C:\Python27\gnuplot\binary;
C:\Program Files (x86)\pythonxy\SciTE-3.3.2-3;
C:\Program Files (x86)\pythonxy\console;
C:\MinGW32-xy\bin;
C:\Program Files (x86)\pythonxy\swig;
C:\Program Files (x86)\pythonxy\gettext\bin;
C:\WINDOWS\system32;
C:\WINDOWS


I tried the following:

$envath = $envath + ";C:\Python27\"
[Environment]::SetEnvironmentVariable("Path", "$envath;C:\Python27", "User")


without success. (I tried starting a new Powershell session, of course, and even tried to reboot my PC)

Could it be that PowerShell doesn't properly read the path variable, or I don't have some permission? I am lost, especially knowing that this work fine on another Windows 7 install. I note that typing:

python.exe


...opens a Python terminal as expected.

Edit : Ok I tried the following test.py code :

# -*- coding: utf-8 -*-
print "Hello"
input()

python.exe test.py


open a new terminal with "Hello" in it and wait for my input but I don't want that, I expect the normal behaviour, with "Hello" printed in PowerShell, error message in PowerShell and so on.

Edit2 : I noticed that the "Path" variable given in PowerShell by: Get-ChildItem Env

Is not equal to the one in the W7 options "System -> Advanced System settings -> Environment variable" . it was only :

;C:\Python27


Like if my previous command line [Environment]::SetEnvironmentVariable("Path", "$envath;C:\Python27") just wrote in it. Fixing this didn't solve my problem either.

Continue reading...