Global Variables. Migrate code from MatLab

[Felipe]

Do not use global
You give argument to function and return value out.

Well that's a way, but some functions has a lots of arguments.
Using global I can simplify my code and avoid atributions errors.

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I don't quite understand the question. Can you show the problem(s) that arise from not being able to do what you want to?

Ok, I wrote this simple code to illustrate the problem.

Here's my main file:

#!/usr/bin/env python3

import numpy as np
from function import fwd

global I 

I = 90

result = fwd()
print(result)

My function "fwd" are in another file. This is the function code:

#!/usr/bin/env python3

def fwd():
    global I
    J = 10
    K = I + J
    return [K]

When I try to run I receive this error:

Error:
" NameError: name 'I' is not defined "

Basically, I want my program to call different functions, that can use the globals to do the math which I need to calculate different physics properties.

Thanks for the help.