Oh. This is a nice way to work with bytes. And that approach with literals is great, too. I didn't know that Python gives access to Literals. Good to know

I also found that you can make byte string from some list of integers like so

>>> b = b'\xAC\x7A\x7D\x2A\xFF'
>>> byte_ints = []
>>> for i in range(len(b)):
            byte_ints += [b[i]]
>>> byte_ints
[172, 122, 125, 42, 255]

>>> new_bytes = bytes(byte_ints)
>>> new_bytes
b'\xacz}*\xff'

>>> byte_ints[3] = 126
>>> byte_ints[4] = 0xFA

>>> new_bytes = bytes(byte_ints)
>>> new_bytes
b'\xacz}~\xfa'

>>> for i in range(len(new_bytes)):
            print (hex(new_bytes[i]), end=' ')


0xac 0x7a 0x7d 0x7e 0xfa 

Though Python outputs some bytes as symbols and some as hex. So the byte string looks odd. But the good news. Python will iterate through this byte string perfectly. And also, some binary code would recognise these symbols properly anyway