chap10Q3.py

def push(stack, x):
    stack.insert(0, x) # this way top is always at the front

def pop(stack):
    return stack.pop(0) # pops from the front because it is the top

l = [4, 5, 6, 7]
push(l, 8) # l becomes [8, 4, 5, 6, 7] x = pop(l)
print(l)
pop(l)
print(l)