Not able to access Python from MATLAB on Apple silicon

I referred this page https://in.mathworks.com/matlabcentral/answers/1977529-how-to-use-python-from-matlab-on-mac-with-apple-silicon?s_tid=mwa_osa_a, and executed the command "arch -x86_64 python3 -m pip myPythonPackage" from my python virtual environment, and thought that it would resolve my problem of not able to access "py.sys.path", but it didn't help. I get the following error:

Python commands require a supported version of CPython. See Getting Started with Python.

My Python environement is given as below when printed from within MATLAB:

PythonEnvironment with properties:

Version: "3.9"

Executable: "/Users/<user-name>/venv/bin/python"

Library: "/opt/homebrew/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/lib/libpython3.9.dylib"

Home: "/Users/<user-name>/venv"

Status: NotLoaded

ExecutionMode: InProcess

Note that executing "arch -x86_64 python3 -m pip myPythonPackage" resulted the following error:

arch: posix_spawnp: python3: Bad CPU type in executable

My MATLAB verison is 2021b on Apple M1 Pro

Any help will be highly appreciated.

[Somnath Mukherjee]

Hi,

Can someone please respond to this query?

Regards,

Somnath

Answer 1

[Karanjot]

Hi Somnath,

Do you have the Rosetta 2 translation layer for Apple Silicon macs installed?

If you haven't been prompted for any other app already, manually install Rosetta 2:

softwareupdate --install-rosetta

Adittionally, If this doesn't resolve your issue, I recommend running the following command & inspecting the results.

which -a python

Multiple python installations could be causing this error as well, if the wrong one is being invoked.

Do note that only certain python versions are supported for MATLAB R2021b. You may check the supported versions at the webpage below:

https://www.mathworks.com/support/requirements/python-compatibility.html

[Somnath Mukherjee]

Hi,

I tried your suggestion and please see the result below.

<python-virtual-env>$ softwareupdate --install-rosetta
I have read and agree to the terms of the software license agreement. A list of Apple SLAs may be found here: https://www.apple.com/legal/sla/
Type A and press return to agree: A
2024-04-10 20:26:59.033 softwareupdate[31850:3288130] Package Authoring Error: 052-77538: Package reference com.apple.pkg.RosettaUpdateAuto is missing installKBytes attribute
Install of Rosetta 2 finished successfully

I get a package authoring error when I run the above command.

Regardign the python verison, as you can see in my previous message, it's 3.9. And as per the page here , it's supported on 2021b.

Regards,

Somnath

[Karanjot]

Hi,

This seems to be an issue with Rosetta / Apple. Although, Rosetta installation was completed sucessfully as the next line suggests that.

[Somnath Mukherjee]

Ok. So, do you have any further recoomendations on what should be done next?