To write a program leverages a custom function that you write for yourself. Put the function in a separate file. Create 5 different main program files that call the function in the following different ways, substituting the variables in italics with values that suit your code:

import module_name
from module_name import function_name
from module_name import function_name as some_name
import module_name as some_name
from module_name import *

Note that you will need to modify several of your main program files in order to call your function correctly.