Positive integer from Python hash() function

Positive integer from Python hash() function

I want to use the Python hash() function to get integer hashes from
objects. But built-in hash() can give negative values, and I want only
positive. And I want it to work sensibly on both 32-bit and 64-bit
platforms.
I.e. on 32-bit Python, hash() can return an integer in the range -2**31 to
2**31 - 1. On 64-bit systems, hash() can return an integer in the range
-2**63 to 2**63 - 1.
But I want a hash in the range 0 to 2**32-1 on 32-bit systems, and 0 to
2**64-1 on 64-bit systems.
What is the best way to convert the hash value to its equivalent positive
value within the range of the 32- or 64-bit target platform?
(Context: I'm trying to make a new random.Random style class. According to
the random.Random.seed() docs, the seed "optional argument x can be any
hashable object." So I'd like to duplicate that functionality, except that
my seed algorithm can't handle negative integer values, only positive.)