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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)
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