Since hexadecimal numbers are really strings representing a numeric value, you best convert these strings to a denary (base 10) number, do the mathematical operation and change the result back to the hexadecimal. Here is an example ...
def add_hex2(hex1, hex2):
"""add two hexadecimal string values and return as such"""
return hex(int(hex1, 16) + int(hex2, 16))
print add_hex2('0xff', '0xff') # 0x1fe
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DaniWeb's Hypocrite
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