Assignment In this assignment you will process some grades for your professor so you can learn how to write loops. You may not use the built-in Python functions to do these operations. Each function should use a while loop to implement the equivalent functionality Complete the following functions defined in the code below. .get_grades0 should iterate with a while loop to put all positive values into a list called grades until encountering a negative value average0 should return the average of all the values in grades list. If grades is empty, average should be zero. maximum0 should return the maximum grade in grades list. If grades is empty, maximum should be zero minimum0 should return the minimum grade in grades list. If grades is empty, minimum should be zero. print grades0 should print the grades each on a separate line. It should not print in list format Example main output Enter grade: Enter grade: Enter grade: Enter grade: Enter grade: 55.0 83.0 92.0 27.0 Average: 64.25 Max: 92.0 Min: 27.0 Note: DO NOT USE FOR LOOPS OR BUILT IN LIST FUNCTIONS (except len0 and append0) LAB ACTIVITY 6.6.1: A6 Program main.py 1 def average(grades): 2 pass 4 def maximum(grades): 6 pass 7 def minimum(grades): pass 10 def print_grades(grades): pass 12 13 def get_gradesO: 14 15 16 def mainO: 17 grades = get-grades 18 pass 16 def mainO: 17 grades get_gradesO 18 19 print_grades(grades) 20 print("Average:", average(grades)) 21 print("Max: ", maximum(grades)) 22 print("Min:", minimum(grades)) 23 24 if-name--'-main-' : 25 main)