python how to use functions defined in another file if they require certain packages code example

Example 1: import from another file python

----FILE_1----
def mult(a, b):
  return a * b

----FILE_2----
from FILE_1 import mult

print(mult(2, 4))
# >>> 8

Example 2: python use functions from another file

#If you want to import all functions from file... but you will still need to
#mention the file name:
import pizza
pizza.pizza_function()

#If you want to import every function but you dont want to mention file name:
from pizza import *
pizza.pizza_function()

Example 3: python include another python file

#import all from myfile.py (in same directory)
from myfile import *