[Python] Python imports from inside the package

I'm trying to use a github repository that I cloned locally.

The repo is structured like this:

project-name
| __init__.py
|____project-name
| __init__.py
| http_service.py
| data.py


Now I'm trying to import stuff from http_service.py, like this:

import sys
sys.path.append('/.../project-name/project-name/')
from http_service import classname


But when I do this, an import inside the http_service.py file fails. The error message is: ModuleNotFoundError: No module named 'project-name.data'

The http_service.py file has this:

from project-name.data import xyz

Clearly, I don't understand how this is supposed to work. How can the http_service file import from project-name when it's inside that directory? And what am I supposed to do differently to use this code?

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