Can't import panda3d with Homebrew python on Mac

Installation
1

When installing Panda using the SDK packages on Mac, it can not be imported when using python3 installed with Homebrew.

Panda detects that Python 3 is installed and install Python 3 bindings (3.7 in this case), but then import fails with the usual error :

ModuleNotFoundError: No module named 'panda3d'

The problem is that the pth file for Python3 is installed assuming /Library/Frameworks//Python.framework/Versions/3.7 as sys.prefix

Or Homebrew uses /usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7 as sys.prefix.

Simply copying /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/Panda3D.pth into /usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (which is a symlink to /usr/local/lib/python3.7/site-packages) solves the problem.

A nice feature would be that the SDK installer could detect the Homebrew version and copy the pth file into /usr/local/lib/python3.7/site-packages

2

Which version of Panda3D is this? I vaguely recall that a similar issue was fixed:

Is the fix not sufficient for Homebrew? I suppose we could simply add to the list of paths that we write the .pth file to.

3

It’s with 1,.10.4.1 so the fix is in. It seems that Homebrew ignores what is in /Library (which actually makes sense)

4

OK, I guess we can add something to /usr/local/lib/python3.7/site-packages. Out of curiosity, can you print the full sys.path?

5

Here they are :

$ python3 -c 'import sys; print(sys.prefix); print(sys.path)'

/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7
['', '/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python37.zip', '/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7', '/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-dynload', '/usr/local/lib/python3.7/site-packages', '/Developer/Panda3D']

Edit: Just to clarify, the ‘/Developer/Panda3D’ entry in sys.path is due to Panda3D.pth in /usr/local/lib/python3.7/site-packages

6

My bad, I forgot to create the issue in the bug tracker, here it is : https://github.com/panda3d/panda3d/issues/755