ModuleNotFoundError when importing another package

Question

I'm trying to import a class from a script that is located in another package:

project_folder | | package_1 | | __init__.py | |foo.py | | | package_2 | | __init__.py | | bar.py

In the script: "bar.py", I have the following import:

from package_1.foo import Class

This line generates the error:

ModuleNotFoundError: No module named 'package_1'

What does instance refer to? How do you start your script (what command)? — sinoroc
– sinoroc, Commented Oct 12, 2020 at 11:18
I simplified the code, however forgot to change the module name. I have changed the description. I start my code by python bar.py. — Maarten
– Maarten, Commented Oct 12, 2020 at 11:20

tplusk · Accepted Answer · 2020-10-12 11:34:44Z

If you are running the code from the package_2 directory then package_1 is not in your path so there is no knowledge of it to the interpreter.

From the project_folder directory you could run python -m package_2.bar and then it will be in your path.

By path I mean the environment variable that is the list of directories the python interpreter looks for packages. By default it is some places relative to where you have python installed + the current directory. You could manually update this variable to be whatever you want (See https://docs.python.org/3/install/index.html#modifying-python-s-search-path) but the most consistent way to run what you are describing is to run it from the directory above.

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