[FIXED] Can't import module: module can't be found in working file but works fine in another file

Issue

I have the following file structure

Working Directory
  |
  |-- Package
  |     |-- __init__.py
  |     |-- FirstModule.py
  |     |-- SecondModule.py
  |     |-- TestingFile.ipynb
  |
  |-- WorkingFile.ipynb

FirstModule.py

def func(n):
    return n+1

SecondModule.py

import FirstModule

def func2(n):
    value = FirstModule.func(n)
    return (n, value)

When I import either module into TestFile.ipynb they work perfectly fine as shown here:

TestingFile.ipnyb

import FirstModule   # Works Fine
import SecondModule  # Works Fine

However, If I am in WorkingFile.ipynb and try to import SecondModule I receive a ModuleNotFoundError. More Specifically:

WorkingFile.ipynb

from Package import SecondModule as sm
from Package import FirstModule as fm

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-14-8a837a311e6c> in <module>
      2 import numpy as np
      3 
----> 4 from Package import SecondModule as sm
      5 from Package import FirstModule as fm

~\Documents\Jupyter Notebooks\Working Directory\Package\SecondModule.py in <module>
     26 from datetime import datetime
     27 
---> 28 import FirstModule as fm
     29 
     30 # Constants

ModuleNotFoundError: No module named 'FirstModule'

Could there be something that I am forgetting that is needed for modules to work together outside of the package that they are contained inside of?

Solution

The issue is the import statement in SecondModule.py.

I was able to reproduce the error using your example and when I change the import statement from

import FirstModule.py

to

from Package import FirstModule

It all works fine. You should not use the filename i.e. drop the .py from the import statement

You should use the package name explicitly when importing modules or alternatively use relative imports, i.e.

from . import FirstModule

or in case you only want specific objects/functions

from .FirstModule import some_function

Answered By - Omri Bahat Treidel