Python中&、^与and、or

list1 = [1, 2, 3, 4, 57, 8, 90]
list2 = [2, 3, 4, 5, 6, 7, 8]
lis = list1 + list2
print('&的结果：', set(list1) & set(list2))
print('^的结果：', set(list1) ^ set(list2))
print('and的结果：', set(list1) and set(list2))
print('or的结果：', set(list1) or set(list2))

&的结果： {8, 2, 3, 4}
^的结果： {1, 5, 6, 7, 57, 90}
and的结果： {2, 3, 4, 5, 6, 7, 8}
or的结果： {1, 2, 3, 4, 8, 57, 90}

def __and__(self, *args, **kwargs): # real signature unknown
    """ Return self&value. """
    pass