[Python-ideas] incremental hashing in __hash__

[Steven D'Aprano]

On Fri, Dec 30, 2016 at 07:08:27PM -0800, Ethan Furman wrote:

> So maybe this will work?
> 
>     def __hash__(self):
>         return hash(self.name) * hash(self.nick) * hash(self.color)

I don't like the multiplications. If any of the three hashes return 
zero, the overall hash will be zero. I think you need better mixing than 
that. Look at tuple:

py> hash((0, 1, 2))
-421559672
py> hash(0) * hash(1) * hash(2)
0



-- 
Steve