Python – ModuleNotFoundError thrown when calling a function that imports another module in the same directory

Question

I have the following Python file structure.

-- main.py

-- scripts/

        -- __init__.py
        -- helper_functions.py
        -- mytest.py

mytest.py has the following function.

def test():
    print("test")

helper_functions.py imports the mytest module and use the test function as

import mytest

def hello():
    mytest.test()
if __name__=="__main__":
    mytest.test()

__init__.py imports the hello function from helper_functions.py module so that the main.py outside the scripts folder can directly use the hello function.

from scripts.helper_functions import hello

main.py tries to call the hello function directly:

from scripts import hello

if __name__=="__main__":
    hello()

When I tried to run main.py, the following error was thrown:

Traceback (most recent call last):
  File "main.py", line 1, in <module>
    from scripts import hello
  File "scripts__init__.py", line 1, in <module>
    from scripts.helper_functions import hello
  File "scriptshelper_functions.py", line 8, in <module>
    import mytest
ModuleNotFoundError: No module named 'mytest'

It seems the mytest module couldn’t be imported into helper_functions.py. How can this be fixed?

Asked By: alextc

||

Source

Answer 1

In helperfunctions.py replace your code:

import mytest

def hello():
    mytest.test()
if __name__=="__main__":
    mytest.test()

As following:

from scripts import mytest

def hello():
    mytest.test()
if __name__=="__main__":
    mytest.test()

Answered By: Gaurav Monga

Answer 2

Your main.py and mytest.py are not in the same directory.
To solve the error either put main.py in the same directory as mytest.py or replace import mytest with from scripts import mytest in helper_functions file. Then main.py will be able to access mytest.py. Modified helper_functions.py:

try:
    import mytest
    
except:
    from scripts import mytest

def hello():
    mytest.test()
if __name__=="__main__":
    mytest.test()

The try and except block checks if mytest.py is in the same directory as the file that calls it. If it is in the same directory, then, import mytest is used. Otherwise from scripts import mytest is used.

Answered By: Dinux

Python – ModuleNotFoundError thrown when calling a function that imports another module in the same directory

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