CODEWITHSUNDEEP
pythonpython-3.x
Mojimi
Mojimi

Reputation: 3161

Python imported module dependency

Let's say I have file main.py :

import math
import mymodule.py
print(math.ceil(5/3))

and then mymodule.py :

print(math.ceil(10/3))

mymodule.py gives an error that math is not defined, even though its parent module has it imported.

Considering both main.py and mymodule.py need to use the math lib, do I need to import it twice? It just seems non-optimal. What's the most pythonic way to solve this issue?

I know it's a dumb example, but I'm trying to fragment a code I made into several modules for organization, and this issue appeared multiple times in several levels

Upvotes: 2

Views: 5337

Answers (2)

tadamhicks
tadamhicks

Reputation: 925

This is really very basic. If you have something in a separate file, like mymodule.py, then you can import that function in any python file easily in the same directory.

two files:

mymodule.py:

import math

def aFunc():
    return math.ceil(10/3)


# We could also just use this file as a standalone
if __name__ == "__main__":
    print(aFunc())

main.py:

import mymodule

print(mymodule.aFunc())

You could also specifically call out the function you want to import.

main.py (alternative):

from mymodule import aFunc

print(aFunc())

Upvotes: 1

Anil_M
Anil_M

Reputation: 11453

mymodule.py is parent for main.py since you are importing mymodule within main.
You need to import math within mymodule so that it gets inherited in main.
Then there won't be a need to import within main.

mymodule.py

import math

main.py

import  mymodule
print mymodule.math.pow(10,2)

Result:

>>> 
100.0
>>>

Upvotes: 1

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