How to add to the PYTHONPATH in Windows, so it finds my modules/packages?


I have a directory which hosts all of my Django apps (C:\My_Projects). I want to add this directory to my PYTHONPATH so I can call the apps directly.

I tried adding C:\My_Projects\; to my Windows Path variable from the Windows GUI (My Computer > Properties > Advanced System Settings > Environment Variables). But it still doesn't read the coltrane module and generates this error:

Error: No module named coltrane

5/4/2019 11:11:37 AM

Accepted Answer

You know what has worked for me really well on windows.

My Computer > Properties > Advanced System Settings > Environment Variables >

Just add the path as C:\Python27 (or wherever you installed python)


Then under system variables I create a new Variable called PythonPath. In this variable I have C:\Python27\Lib;C:\Python27\DLLs;C:\Python27\Lib\lib-tk;C:\other-folders-on-the-path

enter image description here

This is the best way that has worked for me which I hadn't found in any of the docs offered.

EDIT: For those who are not able to get it, Please add


along with it. Else it will never work.

5/18/2018 7:46:13 PM

Windows 7 Professional I Modified @mongoose_za's answer to make it easier to change the python version:

  1. [Right Click]Computer > Properties >Advanced System Settings > Environment Variables
  2. Click [New] under "System Variable"
  3. Variable Name: PY_HOME, Variable Value:C:\path\to\python\version enter image description here
  4. Click [OK]
  5. Locate the "Path" System variable and click [Edit]
  6. Add the following to the existing variable:

    %PY_HOME%;%PY_HOME%\Lib;%PY_HOME%\DLLs;%PY_HOME%\Lib\lib-tk; enter image description here

  7. Click [OK] to close all of the windows.

As a final sanity check open a command prompt and enter python. You should see

>python [whatever version you are using]

If you need to switch between versions, you only need to modify the PY_HOME variable to point to the proper directory. This is bit easier to manage if you need multiple python versions installed.

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