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Before you mark it as duplicate please read my problem:

I am trying to import a class from a file from a subdirectory

> main.py
> --->folder/
> ----->file.py

and in file.py i have a class imlpemented ( Klasa) What have I tried:

putting in main.py:

from folder import file
from file import Klasa

I am getting the error:

from file import Klasa

ImportError: No module named 'file'

When I try to use just:

from folder import file

I get this error:

tmp = Klasa()

NameError: name 'Klasa' is not defined

I have put an empty __init__.py in the subfolder and it still does not work, and I have put in the __init__.py : from file import Klasa and still doesnt work.

If main and file are in the same folder this work:

from file import Klasa

but i want them to be in separate files.

Can someone tell me what i am doing wrong?

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kemis
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1 Answers1

333

Your problem is basically that you never specified the right path to the file.

Try instead, from your main script:

from folder.file import Klasa

Or, with from folder import file:

from folder import file
k = file.Klasa()

Or again:

import folder.file as myModule
k = myModule.Klasa()
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    It works for me once I include an empty `__init__.py` file in the target directory containing class that is to be imported. – Erdem Tuna Jul 17 '19 at 17:53
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    Simply "import Useful_Classes" (in file called "Useful_Classes.py") and then "from Useful_Classes import Hypothesis_Set" works. I added the magical/highly-nonintuitive/WTF !?!?! file "_ _ init _ _ .py" (no spaces in file name, spaces introduced to avoid unintentional bolding by HTML) to the directory. I also had to restart the kernel. There were many wrong turns on the route to this solution. This answer was one of the wrong turns. Python 3.10 in May 2022. – Peter Leopold May 28 '22 at 20:06