enum.py 文件源码

def __hash__(self):
        # taken from collections.Set
        max_i = sys.maxint
        mask = 2 * max_i + 1
        n = len(self)
        h = 1927868237 * (n + 1)
        h &= mask
        for x in self:
            hx = hash(x)
            h ^= (hx ^ (hx << 16) ^ 89869747) * 3644798167
            h &= mask
        h = h * 69069 + 907133923
        h &= mask
        if h > max_i:
            h -= mask + 1
        if h == -1:
            h = 590923713
        return h