Hi, There are python packages (e.g. scipy) that I would like to use but not installed under "Slicer 4.6.2\lib\Python\Lib\site-packages". If I already have Python 2.7 and all packages I want installed on my computer, can I add path in Slicer so it knows where to find those packages? I tried t…

For Slicer 4.10 I would probably suggest opening a terminal window to the location of PythonSlicer and doing PythonSlicer.exe -m pip install scipy. The error you are getting is because the “pip” package was updated and “main” was moved out. You could try some work around as was suggested earlier in …

Thank you so much for your response. it worked. I am also going to update Slicer to 4.11. Thank you again

[image] Saima: pipmain([‘install’,‘scipy’]) pipmain([‘install’,‘pynrrd’]) Collecting pynrrd Using cached https://files.pythonhosted.org/packages/75/db/d0b421a9cbf84ce2af6f95e433f472b6a49e27e9355c027c8680ca9163af/pynrrd-0.4.0-py2.py3-none-any.whl Could not install packages due to an Environ…

Since you had issues using pipmain and I’m assuming you are using Slicer 4.10, then you should try PythonSlicer.exe -m pip install pynrrd to install this pure python package. Don’t use pipmain if you’re using Slicer 4.11 nightly. If you’re using Slicer 4.11 nightly, you can easily use slicer.util.p…

[image] jamesobutler: slicer.util.pip_install(‘pynrrd’) i am using slicer 4.11.0 nightly I followed and got slicer.util.pip_install(‘pynrrd’) Collecting pynrrd Using cached https://files.pythonhosted.org/packages/75/db/d0b421a9cbf84ce2af6f95e433f472b6a49e27e9355c027c8680ca9163af/pynrrd-0.…

I see you are using windows, therefore you have installed Slicer into Programs files folder without writing permissions for slicer. You shall uninstall Slicer and reinstall in a writable folder like Documents, etc. This will solve your problems.

It seems that it is a recent Slicer Preview version, which installs itself to a writeable location by default, so write access should not be an issue. pynnrd does not seem to be available on PyPI: >>> pip_install('pynnrd') Loading Slicer RC file [C:/Users/andra/.slicerrc.py] Collecting pynnrd Co…

@lassoan The output error you posted happened because you tried to install pynnrd instead pynrrd. Just a simple typo. I was able to successfully install this pynrrd package using slicer.util.pip_install('pynrrd'). I do think the previous errors have been due to some messed up cache of the download…

[image] jamesobutler: The output error you posted happened because you tried to install pynnrd instead pynrrd . Just a simple typo. Good catch, thank you!

thankyou so much yes it was a typo [image]

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