>>> 3 not in [2, 3, 4]
False
>>> 3 not in [4, 5, 6]
True
或与元组：
>>> (2, 3) not in [(2, 3), (5, 6), (9, 1)]
False
>>> (2, 3) not in [(2, 7), (7, 3), "hi"]
True
检查Python列表中是否有东西
检查Python列表中是否有东西
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