python 中的in，要看你的目标是什么
1.字符串
>>> "in" in "indigo" True >>> "in" in "violet" False >>> "0" in "10" True >>> "1" in "10" True
2. 数组
>>> "in" in ["in", "out"] True >>> "in" in ["indigo", "violet"] False
3. 字典，是看key
>>> "in" in {"in": "out"}
True
>>> "in" in {"out": "in"}
False 4591
