To convert a byte string into a byte array:
http://stackoverflow.com/a/14267935/399105
[byte_string[i:i+1] for i in range(len(byte_string))]
To reference one element in a byte string:
Use list slicing:
>>> byte_string = b'\x53\xef\x12'
>>> byte_string[0:1]
b'S'
>>> byte_string[1:2]
b'\xef'
Otherwise, you’ll get the integer value of the byte:
>>> byte_string[0]
83
>>> byte_string[1]
239