TypeError: ufunc 'bitwise_and' n

TypeError: ufunc 'bitwise_and' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

python程序提示如上错误，原因是在if语句中&连接符前后的两个条件需要用括号括起来哦，要不然&不知道是连接谁的啦，所以会报错哒

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