Unable to resolve the name py.module

I am trying to call a custom python module in Matlab and I have no issues with running the python standard library modules with py.whatever but when I go to run py.mymodule, I get the error "Unable to resolve the name py.mymodule"

I am able to import the module using py.importlib.import_module('mymodule'), but I cannot call the module or the functions within it.

Any ideas?

[Kojiro Saito]

Your mymodule contains classes with methods, or just methods without a class?

[Michael Rego]

Kojiro,

My module is a simple .py script that has functions that make API calls. I'm not doing anything with objects or classes.

[jesus ceron]

I am facing the same problem. Did you find a solution?

[David Redding]

I also...

[Shrinidhi KR]

Can you share your 'mymodule' script with just briefly showing the functions? Also what is the output that you get for py.importlib.import_module('mymodule') in matlab command window

Also if you are using linux you might want to check this answer: https://www.mathworks.com/matlabcentral/answers/514129-why-does-matlab-error-with-unable-to-resolve-name-when-trying-to-use-python

[Ulugbek Djuraev]

i am getting this error

'Python Error: AttributeError: type object 'h5py.h5.H5PYConfig' has no attribute '__reduce_cython__''

Can youguys help me figure out what this is?

Thank you

[Tom]

I have the same issue, did you solve it?

[Jordi Macià]

I also find the same problem. Some times it loads, and others I get this message:

import py.ifcopenshell

Error: The import statement 'import py.ifcopenshell' cannot be found or cannot be imported. Imported names must end with '.*' or be fully qualified.

Answer 1

[Dan Hazen]

Just because I was caught up with a similar issue that was due to my inexperience:

I had a Python file named testme with a function (def testme) inside of it that printed hello world.

To run in MATLAB, I had to do py.testme.testme() to get it to execute, otherwise I was getting the error you described above. The issue seems to be with referencing the module and then the function within.

[Sterling Baird]

This suggestion seems to work for me. Thank you!

>> py.scipy.odr()
Unable to resolve the name py.scipy.odr.

>> py.scipy.odr.odr()
Python Error: TypeError: odr() missing required argument 'fcn' (pos 1)

Answer 2

[Shishir Singhal]

Hi,

Everytime when you make changes in a python funtion. You need to reload it again into the MATLAB environments using "py.reload("<python_module>")".

As a workaround, please follow the steps given in the documentation here: https://in.mathworks.com/help/matlab/matlab_external/call-modified-python-module.html

Hope it helps!!!

Thanks.

[Ahmed Al-Saffar]

No it doesn't. The question above never mentioned doing changes. I wish I can delete your answer.

Answer 3

[Daniel Toker]

I am running into this same problem, but only sometimes - sometimes py.mymodule works, and other times the exact same code turns up this error. Any progress with this?

[Akshay Dhyani]

I am having a same issue. Sometime it works. some time it doesn't

Answer 4

[Chen]

I am new to Python as well, but I found these solutions after spending some time of debugging. There are two possible reasons for "Unable to resolve the name py.mymodule"

Reason 1:

your python script is not found by the interpreter.

Solution: copy your script into a folder

<your correct Python version folder>\Python38\Lib\site-packages\<mymodule>

Create an empty dummy file __init__.py

Can someone tell me if there's another way to do it?

Reason 2:

Matlab is NOT built to run a python module, like how you would run it in a Python IDE:

run mymodule

You should create a function inside mymodule.py

example,

inside mymodule.py:

....
    def mymodfunc ():
        ... <python codes>

Then run this in matlab:

        py.mymodule.mymodfunc(<some arguments>)

According to instructions, whenever you modify any python scripts, remember to reload them, as per instructions in topic:

Reload Modified User-Defined Python Module

link:: Call User-Defined Python Module - MATLAB & Simulink - MathWorks India

However, this doesn't work directly as per claimed, you have to wrap the reload module within a function. Apparently, this is a known bug that still hasn't been fix for some time:

How can I clear specific Python classes/modules from memory without using "clear classes" - MATLAB Answers - MATLAB Central (mathworks.com)

function reloadPy()
    warning('off','MATLAB:ClassInstanceExists')
    clear classes
    mod = py.importlib.import_module('mymodule');
    py.importlib.reload(mod);
end