Python virtual environment in Matlab

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Birger Venås
Birger Venås 2022-12-14
评论： Birger Venås 2022-12-23
Hi, i tried to run Pyhon code in Matlab by using a virtual environment (venv). If i run from the virtual environment i get an error "Transport stopped"
>> pe2 = pyenv("Version","C:\pyth_test\test3\Scripts\python")
pe2 =
PythonEnvironment with properties:
Version: "3.8"
Executable: "C:\pyth_test\test3\Scripts\python.EXE"
Library: "C:\Users\birgerv\AppData\Local\Programs\Python\Python38\python38.dll"
Home: "C:\pyth_test\test3"
Status: NotLoaded
ExecutionMode: OutOfProcess
>> py.print("hello world")
Transport stopped.
if i run
>> pe = pyenv('Version','3.8',"ExecutionMode","OutOfProcess")
pe =
PythonEnvironment with properties:
Version: "3.8"
Executable: "C:\Users\birgerv\AppData\Local\Programs\Python\Python38\pythonw.exe"
Library: "C:\Users\birgerv\AppData\Local\Programs\Python\Python38\python38.dll"
Home: "C:\Users\birgerv\AppData\Local\Programs\Python\Python38"
Status: NotLoaded
ExecutionMode: OutOfProcess
>> py.print("hello world")
hello world
>>
it works. I really need to work in a virtual environment, but can not find out why it is not working.
  2 个评论
Rajeev
Rajeev 2022-12-20
Have you tried this?
pe2 = pyenv("Version", "C:\pyth_test\test3\Scripts\python", "ExecutionMode","OutOfProcess")
Birger Venås
Birger Venås 2022-12-20
yes, same result. "OutOfProcess" is default i think. "InProcess" gives the same result: "Transport stopped".
pe = pyenv('Version','3.8',"ExecutionMode","OutOfProcess")
works in both "OutOfProcess" and "InProcess".

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回答（1 个）

Rajeev
Rajeev 2022-12-21
编辑：Rajeev 2022-12-21
This is a known issue that the development team has been notified of.
In the meantime, I have a temporary workaround for your Python interface in MATLAB:
This workaround assumes that:
  1. The Python version installation on machine is located at C:\Users\<username>\AppData\Local\Python\python.exe
  2. The virtual environment is generated under C:\Users\<username>\venvs\myenv\
Please follow these steps to implement the workaround:
1. Set "pyenv" to the base Python installation that the "venv" is used for creating the virtual environment "myenv" in the MATLAB Command Window. For example:
>> pyenv('Version', 'C:\Users\<username>\AppData\Local\Python\python.exe')
2. Add the site-packages directory of the "myenv" virtual environment to the "py.sys.path" in the MATLAB Command Window. For example:
>> p = py.sys.path
>> p.insert(int32(0), 'C:\Users\<username>\venvs\myenv\Lib\site-packages')
The setting of "py.sys.path" must be done at the beginning of every Python Interface session and it should be set to the libraries under the "myenv" virtual environment.

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