I ran into a similar issue recently, but I'm not sure it it's 100% same.
What I can suggest is:
2. Try "InProcess" mode:
pe=pyenv('Version','C:\path\to\Python36\pythonw.exe',...
...'ExecutionMode','OutOfProcess'... --- this (new mode) causes misc. issues in R2019b update 5
'ExecutionMode','InProcess'... --- this (old mode) works OK
);
3. Try to explicitly import numpy:
pe=pyenv('Version','C:\path\to\Python36\pythonw.exe',...
'ExecutionMode','InProcess');
py.importlib.import_module('numpy')
if it produces something like this:
>> py.importlib.import_module('numpy')
Error using __init__><module> (line 54)
Python Error: ImportError:
IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
<...>
it is likely that Python cannot see the necessary dll files. Adding them to path fixes the issue for me.
This only happens to me when I use Anaconda python installation :
conda create -n test_py36 python=3.6 numpy
I never ran into this issue when using CPython 3.6.8.
But for Anaconda, the issue could be fixed by simply adding the folder with the neccessary dlls to %PATH%:
username = getenv('username');
setenv('PYTHONUNBUFFERED','1'); % doesn't change much, but just-in-case
setenv('path',['C:\Users\' username '\Anaconda3\envs\test_py36\Library\bin;', getenv('path')]);
pe=pyenv('Version',['C:\Users\' username '\Anaconda3\envs\test_py36\pythonw.exe'],...
'ExecutionMode','InProcess');
py.importlib.import_module('numpy')
