Can't replace hex in bytes with python

Question

>>> data=b'\x11\x22'
>>> data.hex()
'1122'
>>> len(data)
2
#let's try to replace data ....
>>> data.replace(b'1122',b'3344').hex()
'1122'

Why I can't replace with replace 0x1122 to 0x3344?

Answer 1

Because your bytes doesn't contain 1122 (four discrete ASCII values representing '1' , '1' , '2' , '2' ), it contains \x11\x22 (two discrete raw byte encodings, 0x11 , 0x22 ). If you want to replace the raw byte values, provide them for the replacement, eg

data.replace(b'\x11\x22',b'\x33\x44').hex()