#Run the following program

#Pay attention on function replace

#Function replace doing the following:
#a. loops through the list 
#b. counts the number of elements divisible by 3 
#c. replaces each element div by 3 with item

#Function replace returns the number of replaced elements 

#PAY ATTENTION: FUNCTION REPLACE CHANGES THE LIST AND THE CHANGES 
#PRESERVED IN MAIN

#IN PYTHON: Function has an ability to change the list and the changes
#preserved after function is done. No need to return a new list. The old 
#list will be changed. 




import random

def randomint_list(size, min_limit, max_limit):
        my_list=[]
        for i in range(size):
                n=random.randint(min_limit, max_limit)
                my_list.append(n)
        return my_list

def replace(my_list, item):
	count = 0
	for i in range (len(my_list)):
		if(my_list[i]%3 == 0):
			count += 1
			my_list[i] = item
	return count

def addFive(a):
	a = a + 5
	print("in function a= ", a)

def main():
	#Part 1 shows you that Python function cannot change the value of 
	#of the NOT LIST variable
	a = 10
	print("before function a = ", a)
	addFive(a)
	print("after function a = ", a)
	my_list = randomint_list(10, 1, 100)
	print("list BEFORE function replace is called")
	print(my_list)
	count = replace(my_list, 0)
	print("AFTER function replace ")
	print(my_list)
	print("function replaced", count, "elements with ", 0)
main()