>>> a = [1, 2, 3] >>> b = a >>> a.append(4) >>> b.append(5) >>> print a, b
[1, 2, 3, 4, 5] [1, 2, 3, 4, 5]
[1, 2, 3, 4] [1, 2, 3, 4, 5]
[1, 2, 3, 4, 5] [1, 2, 3, 5]
[1, 2, 3, 4] [1, 2, 3, 5]
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