Why doesn't Python hash function give the same values when run on Android implementation?

Question

I believed that hash() function works the same in all python interpreters. But it differs when I run it on my mobile using python for android. I get same hash v

Answer 1

for old python (at least, my Python 2.7), it seems that

hash() = id() / 16

and for CPython id() is the address in memory - http://docs.python.org/2/library/functions.html#id

>>> id(int) / hash(int)                                                     
16                                                                              
>>> id(int) % hash(int)                                                 
0                                                                               

so my guess is that the Android port has some strange convention for memory addresses?

anyway, given the above, hashes for types (and other built-ins i guess) will differ across installs because functions are at different addresses.

in contrast, hashes for values (what i think you mean by "non-internal objects") (before the random stuff was added) are calculated from their values and so likely repeatable.

PS but there's at least one more CPython wrinkle:

>>> for i in range(-1000,1000):
...     if hash(i) != i: print(i)
...
-1

there's an answer here somewhere explaining that one...