ModuleNotFoundError: No module named in another submodule-CodePudding

I have read a couple of threads on StackOverflow but did not find any answer that has fixed my problem. I'm pretty new to Python and cannot figure out how does modeling system works. I do understand the difference between module and package, but that does not help me with my problem. Here goes:

Here's my project structure:

venv/
root/
    commons/
        config.py
    main/
        main.py

Here's my config.py:

class Config:
...

Here's my main.py

from commons.config import Config
...

when running (venv) python3 root/main/main.py I get ModuleNotFoundError: No module named 'config'. What am I doing wrong? It is a problem with my app? with my main.py? With the way I execute my main.py?

Execution is done using Python 3.9 on MacOS

CodePudding user response：

The path to config.py is not added to the list of paths where the interpreter looks for modules and hence does find the config module.

A simple workaround is to change in main.py:

from commons.config import Config

from root.commons.config import Config

and execute main.py as a module in the project directory with

python -m root.main.main

When the file is executed as a module it will add the path from where it is executed to the paths the interpreter looks for modules and root.commons.config is a absolute reference from then on.

CodePudding user response：

As @Iliya mentioned, the interpreter doesn't find the way to 'config' module.

You can modify your main.py to fix the issue:

import sys
sys.path.append("absolute_path_to_root")

from commons.config import Config
...

import os
import sys

# set the parent dir into python's search path
current = os.path.dirname(os.path.realpath(__file__))
parent = os.path.dirname(current)
sys.path.append(parent)

from commons.config import Config
...