regex - Increase / Decrease Mac Address in Python from String -

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i have mac address in string form. interested in taking mac string , increasing / decreasing 1 value while keeping integrity of hex in python

ex: 000000001f

-1: 000000001e +1: 0000000020

parse it, change it, print it! 

def change_mac(mac, offset)     return "{:012x}".format(int(mac, 16) + offset)

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