# change a hexadecimal string to decimal number and reverse
# check two different representations of the hexadecimal string
# negative values and zero are accepted
# tested with Python24        vegaseat     11oct2005
 
def dec2hex(n):
    """return the hexadecimal string representation of integer n"""
    return "%X" % n
 
def hex2dec(s):
    """return the integer value of a hexadecimal string s"""
    return int(s, 16)
 
print "dec2hex(255)  =", dec2hex(255)    # FF
print "hex2dec('FF') =", hex2dec('FF')   # 255
 
print
 
print "hex(255) =", hex(255)                # 0xff
print "hex2dec('0xff') =", hex2dec('0xff')  # 255