required implementation for long_hash

[kai-nashi]

Hash of integer long in python2 and python3 has different result. Must implement hash of long

Example:
Python2

hash(10000000000)  #  10000000000
hash(-10000000000)  #  -1410065410
hash(20000000000)  # 1474836476
hash(-20000000000)  # 1474836476
hash(10 ** 20)  # -824746446

Python3

hash(10000000000)  #  10000000000
hash(-10000000000)  #  -10000000000
hash(20000000000)  # 20000000000
hash(-20000000000)  # -20000000000
hash(10 ** 20)  # 848750603811160107

[kai-nashi]

I have wrote implementation of long hash. It work for 32bit, don't test on 64bit.

INT_MAX_VALUE = 2 ** 32

def hash_long(value: int) -> int:
    sign = -1 if value < 0 else 1
    value = abs(value)

    if value >= INT_MAX_VALUE:
        value = value % (INT_MAX_VALUE - 1)

    if value > (INT_MAX_VALUE / 2 - 1):
        value -= INT_MAX_VALUE

    value = sign * value
    if value == -1:
        value = -2

    return value

[davidmezzetti]

Hello. It's been a while since I've changed py27hash. It was primarily designed to help with converting Python 2 programs to Python 3. Given that Python 2.7 has now been EOL for 4 years, not sure how much need there is for this library.