numbers = [1, 2, 3, 4] numbers.append([5,6,7,8]) print len(numbers)
4
5
8
12
An exception is thrown
number = [1, 2, 3, 4, [5, 6, 7, 8]]
numbers = [1, 2, 3, 4] numbers.extend([5,6,7,8]) print(len(numbers)) # 8
numbers.extend([5,6,7,8])
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