import packages from project directory

Question

I have the below file structure:
Project
    app.py
    package_A
        __init__.py
        a_module.py
    package_B
        __init__.py
        b_module.py
    package_C
        __init__.py
        c_module.py
    packageD
        __init__.py
        d_module.py

within d_module.py I am running the following import command:
from package_C.c_module import someFunc
I am continually getting a ModuleNotFoundError: No module named 'package_C'. I have tried a number of different things from using a pipenv shell within the project directory, adding a Pipfile to the project directory. Also creating a virtual environment.
Right now the app.py file is empty as I am just starting the project, is the issue?

pykam · Answer

I'm guessing that the __init__.py in the package_C folder is blank?
Just putting an __init__.py in the a package folder does not automatically give you access to all modules within the package. You only get access to the modules that are imported in the __init__.py file.
This is because when you import a package python runs all the modules in the __init__.py file and adds them to the symbol table.
If you add import c_module in the __init__.py file, you should be able to import any objects from c_module.

jupiterbjy · Answer

For IDE like pycharm will automatically add parents directory to path, thus when ran manually it won't find packages as it's not listed in parents directory.

See this example:

# file: B.__init__.py

try:
    from A import a
    print("IDE import")
except ImportError:
    from os import getcwd
    from sys import path

    path.append(getcwd() + "/..")
    from A import a
    print("without IDE")

print(a)

Folder structure:

Output - in IDE:

IDE import
<module 'A.a' from 'Z:\github\StackOverFlow\A\a.py'>

Output in terminal:

without IDE
<module 'A.a' from 'Z:\github\StackOverFlow\B/..\A\a.py'>

And this also changes when directory is nested once more in project directory, in that case it will always import with path insertion used in except block.

import packages from project directory

2 Answers

Add your own answers!

Ask a Question