"""
write a program that generates random list of 10 ints in range -10, 10

write a function remove_positive(my_list) - removes all positives from the list
write a function remove_negative(my_list) - removes all negatives from the list
write a fucntion remove_zero(my_list) - removes all zero's

"""

import random
def make_random_list(size, min_limit, max_limit):
	return [random.randint(min_limit, max_limit) for i in range(size)]

def remove_positive(my_list):
	#one approach - to create a list of positives first
	#and then remove all positives from original list

	pos=[]
	for item in my_list:
		if(item>0):
			pos.append(item)

	#actual removal part

	for item in pos:
		my_list.remove(item)


	

def remove_negative(my_list):
	"""
	WRONG SOLUTION
	for item in my_list:
		if(item<0):
			my_list.remove(item)
	return my_list
	"""
	"""
	CORRECT SOLUTION #1
	size=len(my_list)
	for i in range(size-1, -1,-1):
		if(my_list[i]<0):
			my_list.remove(my_list[i])

	"""
	for item in my_list[:]:
		if(item<0):
			my_list.remove(item)

def remove_zero(my_list):
	"""
	correct solution similar to remove positive
	zero=[]
	for item in my_list:
		if(item==0):
			zero.append(item)
	for item in zero:
		my_list.remove(item)

	"""
	count_zero=my_list.count(0)
	zero=[0]*count_zero
	for item in zero:
		my_list.remove(item)

def main():
	my_list=make_random_list(10,-10,10)
	print("before removal", my_list)
	#function call
	remove_positive(my_list)
	print("after removal", my_list)

	my_list=make_random_list(10,-10,10)
	print("before removal", my_list)
	remove_negative(my_list)
	print("my_list after removal",my_list)
	my_list=make_random_list(10,-1,1)
	print("before removal", my_list)
	remove_zero(my_list)
	print("my_list after removal",my_list)
main()