Python - Module Not Found Error when running main function in secondary folder

Question

I am a beginner with Python. Before I start, here is my python folder strcuture.

-project
---main.py
---secondary-folder
----------new_main.py
---model
----------__init__.py
----------abc.py

Under project folder I have a model folder which has two python files __init__.py and abc.py which contents follow:

class ABC:
    def print_abc(self):
          print("abc")

Next in my main.py and new_main.py are the same contents:

from model.abc import ABC

if __name__ == "__main__":
   ABC().print_abc()

Whenever I run python3 ./secondary-folder/new_main.py under project folder it results in the error:

Traceback (most recent call last):
  File "./secondary-folder/new_main.py", line 1, in <module>
    from model.abc import ABC
ModuleNotFoundError: No module named 'model'

But the terminal can print out abc if I run main.py under project folder.

Is there anything I missed?

Answer 1

If you try to import something the code is seeking from the folder you have run the file in.

So in folder secondary-folder you have no module (folder) named model. You have to leave that folder with calling parent folder, project in this case.

Try this in new_main.py:

from project.model.abc import ABC

if __name__ == "__main__":
    ABC().print_abc()

Answer 2

After I do some researches, I have got an idea from this link beyond top level package error in relative import

All project folders have to add ini.py like the structure below:

-project
---__init__.py
---main.py
---secondary-folder
----------__init__.py
----------new_main.py
---model
----------__init__.py
----------abc.py

Then run the command python secondary-folder.new_main Everything will be fine.