python import local module from another module

Question

I have the following structure:

root/
    folder1/
        main.py
        secondary.py
    folder2/
        test.py

the main.py code always runs from the root folder, so on the main.py I have an

from folder1.secondary import *

so I can use its functions on main.py - that works fine

on tests.py, I do:

from root.folder1.main import myfunction

(that is the only function I need to test) but it fails saying "ModuleNotFoundError: No module named 'folder1.secondary'

root is on sys.path

I dont understand why importing main.py directly works but importing from another folder doesn't. How can I solve this problem?

Thanks

You can import locally from a script (i.e. when you run main.py directly) but not from a module. You need to change main.py to an absolute import as well: from root.folder1 import * — Phydeaux
– Phydeaux, Commented Feb 22, 2019 at 17:02
(when you from root.folder1.main import ... then main is treated as a module) — Phydeaux
– Phydeaux, Commented Feb 22, 2019 at 17:10
Your question seems similar to this one: stackoverflow.com/questions/54793765/… — thebjorn
– thebjorn, Commented Feb 22, 2019 at 22:32

Aakash Sethi · Accepted Answer · 2019-02-22 20:52:36Z

1

You will have to have a file called __init__.py in each directory so the Python interpreters treats that directory as a module it can import things from. The file can be empty but it has to be named like that.

Your new directory structure would look like:

root/
    __init__.py
    folder1/
        __init__.py
        main.py
        secondary.py
    folder2/
        __init__.py
        test.py

Then you can import your main.py in the test.py by doing from root.folder1.main import myfunction.

answered Feb 22, 2019 at 20:52

Aakash Sethi

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