Mojo (Mac) using wrong python lib

Question

As most Mac users, I have two separate versions of python on my machine: The one installed by Apple (version 3.9 in /usr/bin) and one installed via Homebrew (version 3.11 in /opt/homebrew/bin).

I've put the latter first in path and, sure enough,

which python3

prints

/opt/homebrew/bin/python3

and

python3 --version

prints

Python 3.11.6

but Mojo seems to use the other version, as packages installed via pip3 are not accessible.

The following sys_path.🔥

from python import Python
 
def main():
 
    let sys = Python.import_module("sys")
    print(sys.prefix)

prints

/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9

How do I make Mojo use the correct python lib?

How are you running Mojo? What does the PATH look like inside it? — tripleee
– tripleee, Commented Oct 31, 2023 at 10:13
@tripleee from the terminal. The PATH looks exactly like it is supposed to, everything starting with opt/homebrew/ comes first. And, as mentioned above, calling python3 --version gives me the right one inside that terminal. — volkerschulz
– volkerschulz, Commented Oct 31, 2023 at 11:51
If you are genuinely missing the slash before opt/ then that's the problem right there. — tripleee
– tripleee, Commented Oct 31, 2023 at 11:56

volkerschulz · Accepted Answer · 2023-11-08 06:31:58Z

I've found not one but two possible solutions:

Manually edit ~/.modular/modular.cfg, in group mojo find python_lib and set it to the path to the python lib installed with homebrew. In my case I've had to change

/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/Python3

to

/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.11/lib/libpython3.11.dylib

EXPORTing MOJO_PYTHON_LIBRARY with the correct path will override the config setting for the current session. I've put

export MOJO_PYTHON_LIBRARY="/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.11/lib/libpython3.11.dylib"

in my ~/.zshrc. Don't forget to source or restart the terminal when using the rc file.

The second option comes in handy, if you want to test against different versions of the python lib.

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