[Tutor] Re: how to separate hexadecimal

[Wolfram Kraus]

jrlen balane wrote:
> i have a 4 digit hex number (2 bytes) and i want to separate it into 2
> digit hex (1 byte each) meaning i want to get the upper byte and the
> lower byte since i am going to add this two.
> how am i going to do this?
> should i treat it just like a normal string?
> please help, thanks.
> 
> ex. hexa = '0x87BE"  # what i want to do is:
>       a = 0x87, b = 0xBE    # so that i could do this:
>       c = a + b            #which should be equal to 0x145

Not sure where you get hexa from, but given your example you can use 
int(x, base) with base = 16 to convert your string to an integer and 
then use the %x formatstring:
 >>> hexa = '0x87BE'
 >>> upper = int(hexa[2:4], 16)
 >>> lower = int(hexa[4:6], 16)
 >>> print '0x%x + 0x%x = 0x%x' % (upper, lower, upper+lower)
0x87 + 0xbe = 0x145

HTH,
Wolfram