Calling Python from Matlab / Can I use Python installed by Anaconda? / "NULL pointer returned from Python."

Question

Brian 2022-9-22

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1810410-calling-python-from-matlab-can-i-use-python-installed-by-anaconda-null-pointer-returned-from-p

评论： Hiren 2024-2-16

Would love to use some Python code a colleague wrote. I already have Anaconda installed, so I really don't want to install another version of Python (and associated libraries).

Tried:

pe = ...

pyenv('Version',...

fullfile('e:\', 'anaconda3', 'python.exe'));

myPythonVersion = pe.Version

py.print("Hello, Python!")

Got:

>> pe = ...

pyenv('Version',...

fullfile('e:\', 'anaconda3', 'python.exe'));

myPythonVersion = pe.Version

py.print("Hello, Python!")

myPythonVersion =

"3.8"

NULL pointer returned from Python.

>> py

>> pe

pe =

PythonEnvironment with properties:

Version: "3.8"

Executable: "e:\anaconda3\python.exe"

Library: "e:\anaconda3\python38.dll"

Home: "e:\anaconda3"

Status: NotLoaded

ExecutionMode: OutOfProcess

>>

Matlab Version R2020a (happy to upgrade, just too lazy right now...)

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Answer 1

Brian 2022-9-30

1
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https://ww2.mathworks.cn/matlabcentral/answers/1810410-calling-python-from-matlab-can-i-use-python-installed-by-anaconda-null-pointer-returned-from-p#answer_1064160

编辑：Brian 2022-9-30

Not sure what the best answer is for this issue.

Due to other circumstances, I needed to re-install Matlab and Anaconda. Now everything works:

>> pe = ...

pyenv('Version',...

fullfile('c:\', 'temp', 'anaconda3', 'python.exe'));

>> py.print("Hello, Python!")

Hello, Python!

Is this due to:

Re-installing Matlab?
Installing the latest version of Matlab (R2022b)?
Re-installing Anaconda?
Putting Anaconda on the C:\ ?

sorry, I don't know.

What I do know is that launching from the Anaconda prompt is not required.

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Answer 2

Al Danial 2022-9-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1810410-calling-python-from-matlab-can-i-use-python-installed-by-anaconda-null-pointer-returned-from-p#answer_1064110

在 MATLAB Online 中打开

Try this start-up sequence: first open an Anaconda Prompt or Anaconda PowerShell terminal. Then within that terminal window, type the path to the matlab executable (or is it a launch .bat file on Windows?). Or just type 'matlab' if it is in your system-wide search path.

Then within matlab just do

>> pyenv

with no arguments to see if matlab figured everything out on its own.