How to run Python from MATLAB

Question

I'm trying to run Python from MATLAB, but when I try I got the message:

py.list({'Monday','Tuesday','Wednesday','Thursday','Friday'})

Unable to resolve the name py.list.

I also have tried pyenv

pyenv

ans = 

  PythonEnvironment with properties:

          Version: "3.7"
       Executable: "C:\Users\Familia\.conda\envs\matlab\python.exe"
          Library: "C:\Users\Familia\.conda\envs\matlab\python37.dll"
             Home: "C:\Users\Familia\.conda\envs\matlab"
           Status: NotLoaded
    ExecutionMode: InProcess

Could be my problem the Status? NotLoaded? How can I change that for Loaded? Since this path is with Conda, I also tried to change for another Python version I have installed without Anaconda, with this command:

pe = pyenv('Version','C:\Users\Familia\AppData\Local\Microsoft\WindowsApps\python.exe')

Error using pyenv
Path argument does not specify a valid executable.

How can I overcome that?

See possible problems and solutions in the MATLAB documentation: mathworks.com/help/matlab/matlab_external/… — Cris Luengo
– Cris Luengo, Commented Jul 20, 2020 at 16:37
@CrisLuengo I have tried the suggestions in the link, but still, the same problem, when I use pyenv I got the error: Path argument does not specify a valid executable. — JCV
– JCV, Commented Jul 20, 2020 at 18:52
Jennifer: In particular, have you verified that your MATLAB program is 64-bit and your Python program is also 64-bit? You likely have a 32-bit version of Python installed at that location (if it is there at all). — Cris Luengo
– Cris Luengo, Commented Jul 20, 2020 at 20:41
@CrisLuengo you're right the version of python was 32bit. thank you — JCV
– JCV, Commented Jul 21, 2020 at 8:43

Paolo · Accepted Answer · 2020-07-20 16:47:53Z

2

Well, you are seeing that error because the path you specified is not valid.

Open a Command prompt window and type:

where python

this will return a list of locations of Python installations on your machine. On my machine, the command returns:

C:\Users\paolo\AppData\Local\Programs\Python\Python36\python.exe

so we can use this location when calling pyenv in MATLAB:

>> pyenv('Version','C:\Users\paolo\AppData\Local\Programs\Python\Python36\python.exe')

then I can use py.list:

>> py.list({'Monday','Tuesday','Wednesday','Thursday','Friday'})

ans = 

  Python list with no properties.

    ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']

answered Jul 20, 2020 at 16:47

Paolo

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2 Comments

JCV Over a year ago

I have tried that, and the error I have when I do what you explained is : Error using pyenv Path argument does not specify a valid executable.

Paolo Over a year ago

What's the output of where python?

capuchin7 · Accepted Answer · 2022-03-22 18:38:29Z

1

It worked for me by using the path from a created conda environment exclusively having python 3.7 for Matlab 2021a. So the steps were:

conda create --name matlabpy python=3.7 #You can give any name to the env
Add the path where this "matlabpy" environment is located by clicking in "Set Path" in Matlab
Run py.list({'Monday','Tuesday','Wednesday','Thursday','Friday'})

Hope it works for you as well

answered Mar 22, 2022 at 18:38

capuchin7

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JCV · Accepted Answer · 2020-07-21 08:45:28Z

0

I manage to overcome that uninstalling python and installing again the 64bit, and during the installation, I chose to add python to the path environment and install for all users. That works for me.

answered Jul 21, 2020 at 8:45

JCV

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dML · Accepted Answer · 2022-05-12 11:30:21Z

0

For people working on a network where the MATLAB you are using is installed on another users account you need to share your user's folder with the account that MATLAB is installed on.

Steps:

go to C:\Users and right click on the folder with your username
go to the Sharing tab and click Share...
click on the arrow next to Add, and select Find people...
Search for the user that owns the MATLAB you're using and select it from the search results, then OK
Restart MATLAB

answered May 12, 2022 at 11:30

dML

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