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Python中的appen和extend

appendextend有什么区别?


append:

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

输出:[1, 2, 3, [4, 5]]

extend:

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

输出:[1, 2, 3, 4, 5]