When you run the Python® interpreter out-of-process, you can terminate the interpreter and start a new one, possibly with different version settings, without restarting MATLAB®.
To reload an in-process Python interpreter, see the example Reload Modified User-Defined Python Module.
This example assumes that you have Python version 2.7 and 3.8. If your interpreter is already loaded in-process, then restart MATLAB.
pe = pyenv; if pe.Status == 'NotLoaded' pyenv("ExecutionMode","OutOfProcess","Version","3.8"); end py.list; % Call a Python function to load interpreter pyenv
ans =
PythonEnvironment with properties:
Version: "3.8"
Executable: "C:\Python36\pythonw.exe"
Library: "C:\WINDOWS\system32\python38.dll"
Home: "C:\Python38"
Status: Loaded
ExecutionMode: OutOfProcess
ProcessID: "15176"
ProcessName: "MATLABPyHost"
Reload the Python version 2.7 interpreter.
terminate(pyenv) pyenv("Version","2.7"); py.list; % Reload interpreter pyenv
ans =
PythonEnvironment with properties:
Version: "2.7"
Executable: "C:\Python27\pythonw.exe"
Library: "C:\WINDOWS\system32\python27.dll"
Home: "C:\Python27"
Status: Loaded
ExecutionMode: OutOfProcess
ProcessID: "24840"
ProcessName: "MATLABPyHost"