Paradoxis Paradoxis - 7 months ago 55
Python Question

Unable to import child from parent package python

I'm currently writing a web application in python that needs unit tests, however whenever I try to import a child module that's in another parent directory I get the following error:

$ python my_package/tests/
Traceback (most recent call last):
File "my_package/tests/", line 1, in <module>
from my_package.core.main import hello
ImportError: No module named my_package.core.main

File: my_package/core/

hello = "Hello"

File: my_package/test/

from my_package.core.main import hello

print(hello, "world!")

My directory structure:

$ tree
└── my_package
├── core
│   ├──
│   └──
└── tests

Could someone please explain what I'm doing wrong? Thank you for your time.


It is considered an anti-pattern to modify sys.path. If you want your package to be available to all subpackages, it's better to use development mode. Create in the root of your project:

from setuptools import setup

    packages=['my_package', ],
    install_requires=['requirement1', 'requirement2'],

Then run:

$python develop

After this you will be able to import my_packege from anywhere.