""" This function accepts a list of numbers
builds up and returns a new list
if a number is > 5 adds it to the end of the new  list
otherwise, deletes the last number """

def push_and_pop(list_of_numbers):
    push_pop = []               # Empty to create a new list
    for list_of_number in list_of_numbers:
        if list_of_number > 5:              # Integer > 5
            push_pop.append(list_of_number) # Append it to the new list
        else:
            push_pop.pop()                  # Integer < = 5
    return push_pop

print(push_and_pop([10]))   # [10]
print(push_and_pop([10, 4]))    # []
print(push_and_pop([10, 20, 30]))   # [10, 20, 30]
print(push_and_pop([10, 20, 2, 30]))    # [10, 30]