I'm new to Windows 7 and with my Python installation. When I specify script.py in cmd.exe and hit Return/Enter, instead of executing the python file, I am given an error message (sth like "not a command").

How do I tell Windows to run the Python interpreter when specifying or double-clicking a Python script?


Associate the .py extension with the python.exe interpreter executable. Normally the installer does this for you.

  • Thanks, and here's how to: docs.python.org/faq/windows.html
    – new
    Jun 22 '10 at 8:43
  • 3
    I'd rather suggest to associate the .py extension with the pythonw.exe by default, to anticipate the question "It works now, but I don't want to see that cmd window."
    – vtest
    Jun 22 '10 at 11:21

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