Python 内建函数 - hash(object)

Manual

Return the hash value of the object (if it has one). Hash values are integers. They are used to quickly compare dictionary keys during a dictionary lookup. Numeric values that compare equal have the same hash value (even if they are of different types, as is the case for 1 and 1.0).

Note For object’s with custom __hash__() methods, note that hash() truncates the return value based on the bit width of the host machine. See __hash__() for details.

直译

返回object的哈希值（如果它有一个的话）。哈希值是整数，它们用于在字典查找时快速匹配字典键。相等的数字值具有同样的哈希值（即便它们属于不同的类型，例如1和1.0）

注意：对象自定义的__hash__()方法，hash() 基于主机的位宽来截断返回值，详情见__hash__()。

实例

>>> class 优快云:
    def foobar(self):
        print('Hello 优快云er!')
>>> hash(优快云)
4561779

>>> class 优快云:
    def __init(self):
        self.name = '优快云er'
        self.nick = 'Fans'
        self.color = 'Red'
    def __hash__(self):
        return hash((self.name, self.nick, self.color))
    def foobar(self):
        print('Hello 优快云er!')
>>> hash(优快云)
4561807

拓展阅读

__hash__()