How to get the signed integer value of a long in python?

Question

If lv stores a long value, and the machine is 32 bits, the following code:

iv = int(lv & 0xffffffff)

results an iv of type long, inst

Answer 1

Can I suggest this:

def getSignedNumber(number, bitLength):
    mask = (2 ** bitLength) - 1
    if number & (1 << (bitLength - 1)):
        return number | ~mask
    else:
        return number & mask

print iv, '->', getSignedNumber(iv, 32)