python 连续的运算符号

对于连续的运算符 (例如a < x < b) python会展开成(a < x and x < b)

    >>> 1 in (1, 2)
    True
    >>> 1 in (1, 2) in (1, 2, 3) 
    False
    >>> 1 in (1, 2) in ((1, 2), 3)
    True
    
    
    >>> None is None in (True, False)
    False
    >>> None is False
    False
    >>> None is False in (True, False)
    False
    >>> 1 in (1, 2) == True
    False