Python3 import modules from folder to another folder

Question

my structure dictionary is

mainFolder    
    folder1
       __init__.py
       file1.py
       file2.py    
    folder2
       __init__.py
       file3.py
       file4.py    
    setup.py    
    __init__.py

i need import file4.py from folder2 to folder1/file1.py
file1.py:

from ..folder2.file4 import MyClass

and i gets:

SystemError: Parent module '' not loaded, cannot perform relative import

how to fix that ?

Possible duplicate of Relative imports for the billionth time — Mad Physicist
– Mad Physicist, Commented Dec 11, 2017 at 19:14
@MadPhysicist python3 folder1/file1.py i want run only this file — Kaker
– Kaker, Commented Dec 11, 2017 at 19:14
python -m folder1.file1 from the main folder. Or python -m mainFolder.folder1.file1, depending on how you really want to structure this thing. You currently have a bit of a mess with the setup.py — Mad Physicist
– Mad Physicist, Commented Dec 11, 2017 at 19:15

Denis · Accepted Answer · 2017-12-11 20:32:44Z

7

This is because you must to explicitly name the parent package. So in your case you need either from mainFolder.folder2.file4 import Myclass, either from folder2.file4 import Myclass

answered Dec 11, 2017 at 20:32

Denis

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