Using Lists as Stacks
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#To add an item to the top of the stack, use append(). To retrieve an item from
#the top of the stack, use pop() without an explicit index.
stack = [3, 4, 5]
stack.append(6)
stack.append(7)
print stack
stack.pop()
print stack
print stack.pop()
print stack.pop()
print stack
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