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a = [1, 2, 3] b = a a.append(4) print(b)
print(b)的输出结果为[1, 2, 3]
print(b)
[1, 2, 3]
运行代码会抛出AttributeError: 'list' object has no attribute 'append'
AttributeError: 'list' object has no attribute 'append'
print(b)的输出结果为None
None
print(b)的输出结果为[1, 2, 3, 4]
[1, 2, 3, 4]