ModuleNotFoundError with importlib.import_module for submodule

Question

(my english is really bad sorry)

I write a OOP code and I want a main file who import (auto with importlib) some "templates" to execute. Every templates have a "main file" and others objects for a good oriented programmation. BUT I can't import my "main module" beacause importlib raise ModuleNotFoundError directly on import object at the beginning code (example below). Please help. I try to resolve with inspect lib and ModuleFinder lib or force at parsing my file name in os.listdir but... nothing... I'm totally blocked.

--main.py
--templates/
---__init__.py
---Beer/
----__init__.py
----Beer.py
----Livraison.py

main.py

...
def import_templates(package, recursive=True):
    if isinstance(package, str):
        print(package)
        package = import_module(package)
        print('1 : ' + str(package))
    results = {}
    for loader, name, is_pkg in walk_packages(package.__path__):
        full_name = package.__name__ + '.' + name
        results[name] = import_module(full_name)
        if recursive and is_pkg:
            results.update(import_templates(full_name))
    return results
...

Beer.py

...
from Livraison import Livraison
...

output terminal

templates
1 : <module 'templates' from 'PATH/GestionEmbed/templates/__init__.py'>
templates.Beer
1 : <module 'templates.Beer' from 'PATH/GestionEmbed/templates/Beer/__init__.py'>

Traceback (most recent call last):
  File "PATH/GestionEmbed/main.py", line 59, in <module>
    tmp = import_templates("templates")
  File "PATH/GestionEmbed/main.py", line 45, in import_templates
    results.update(import_templates(full_name))
  File "PATH/GestionEmbed/main.py", line 43, in import_templates
    results[name] = import_module(full_name)
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "PATH/GestionEmbed/templates/Beer/Beer.py", line 7, in <module>
    from Livraison import Livraison
ModuleNotFoundError: No module named 'Livraison'

Thank you in advance if you can help me (and again sorry for my english ^^)

Answer 1

You are running main.py , which imports Beer.py , which tries to import Livraison.py .

The problem is the line in Beer.py which says: from Livraison import Livraison . Python tries to import Livraison based on the position of main.py - so it is like you wrote from Livraison import Livraison in main.py . There is no Livraison.py in the same folder as main.py , so there is an error.

To import based on the position of Beer.py , use:

from .Livraison import Livraison

in Beer.py .

The . means that python imports Livraison based on the position on Beer.py