stack program in python 3

1>>> myStack = []
2
3>>> myStack.append('a')
4>>> myStack.append('b')
5>>> myStack.append('c')
6
7>>> myStack
8['a', 'b', 'c']
9
10>>> myStack.pop()
11'c'
12>>> myStack.pop()
13'b'
14>>> myStack.pop()
15'a'
16
17>>> myStack.pop()
18Traceback (most recent call last):
19File "<console>", line 1, in <module>
20IndexError: pop from empty list