how to separate hexadecimal

[jrlen balane]

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

 

[Paul Rubin]

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

Assuming you really want hexa to begin with the characters '0x', the
string slicing way is:

a, b = hexa[2:4], hexa[4:6] # a = '87', b = 'BE'
c = int(a,16) + int(b, 16)

A more direct arithmetic way is:

x = int(hexa, 16) # x = the integer 0x87be
c = (x >> 8) + (x & 0xff)