Unrecognized python functions when using same-module imports from a custom package

I am unable to get MATLAB to recognize functions within my custom python module if the file is importing anything from another module within the same package.

File Structure:

python_test_lib
| __init__.py
| file_a.py
| file_b.py

file_a.py content:

class ClassA:
    def __init__(self, num):
        self.num = num

file_b.py content

from file_a import ClassA

def function_b():
    ca = ClassA(3)
    print(f'My class A: {ca.num}')

In this toy example, the package is partially imported such that ClassA is available through the interperter via

py.python_test_lib.file_a.ClassA()

But no functions from file_b.py are available. Attempting access yields:

py.python_test_lib.file_b.function_b()
--------------
Unable to resolve the name py.python_test_lib.file_b.function_b()

I've tried various syntaxes for the import statement including

import ClassA
from .file_a import ClassA
from python_test_lib.file_a import ClassA
import file_a

Answer 1

[Shadaab Siddiqie]

From my understanding you want to call python functions in the matlab code. You can do this by setting python path and calling functions as follows:

Set up Python and Python path

pyversion
pathToFile = fileparts(which('file.py'));\
if count(py.sys.pathToSpeech) == 0
    insert(py.sys.path,int32(0),pathToFile);
end

call python function

pyOut = py.file.function_name(inputs to the function)

[Daniel Bronstein]

The python path is already set appropriately. As I said, I am create an instance of ClassA through the interperter. However, function_b is not available and I believe that is due to the fact that it is importing from file_a within the same package. My question is what is the appropriate syntax/file layout to be able to handle these inter-package imports?

If you try setting up the files exactly as described the problem should be evident