module is the current file telling python to do the work of stored file in current file.

So,basically why we have to import the file ?

If there is large program so with help of module we can break in small files.

pizza.py

def make_pizza(
    size,*toopings
    ):
    """ make_pizza       
    function give         
    information about     
    size and toppings"""
    
    print("The size of    
          toppings is     
         "+str(size)       
         +"!")
    for topping in         
    toopings :
       print(tooping)

Create new file im.py

im.py

import pizza

pizza.make_pizza(16,      
        "mushroom",
        "peporoni")

Output:

The size of toppings is:
16

mushroom 
peporoni