Python casts the code long to int

After python2.4, if the value of an int is out of range, it will not overflow, but is internally converted to a long.
Oneself wrote a function, barely can use, for your reference.

import sys
def LongToInt(value):
    assert isinstance(value, (int, long))
    return int(value & sys.maxint)

After testing, the results are consistent on 32-bit and 64-bit.