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python list的extend和append方法

append: Appends object at the end.

x = [1, 2, 3] x.append([4, 5]) print (x)

gives you: [1, 2, 3, [4, 5]]

extend: Extends list by appending elements from the iterable.

x = [1, 2, 3] x.extend([4, 5]) print (x)

gives you: [1, 2, 3, 4, 5]