conversion of bytes to string

Question

Im reading data from an tcp connection. If I read the data from wireshark(network monitor) I get 02501c41d11ec06a471102 but if I read data in python i get it in bytes:

b'\x02P\x1cA\xd1\x1e\xc0jG\x11\x02'
<class 'bytes'>

How do I convert this? I tried this:

#!/usr/bin/env python

import socket
import binascii
import time
import sys

TCP_IP = '10.20.0.195'
TCP_PORT = 9761
BUFFER_SIZE = 2048

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))

while 1:
    data = s.recv(1024)
    print (data)
    data2 = data.decode("utf-8")
    typ = type(data)
    print (typ)

but if in run this I get:

b'\x02P\x1cA\xd1\x00\x00\x02\xcb\x11\x00'
Traceback (most recent call last):
  File "Z:/programeren/domotica/try again/receive.py", line 18, in <module>
    data2 = data.decode("utf-8")
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd1 in position 4: invalid continuation byte

just to be clear i want to turn

b'\x02P\x1cA\xd1\x00\x00\x02\xcb\x11\x00'

into

02501c41d11ec06a471102

You're starting with bytes. .decode('utf-8') means decode from UTF-8 to a unicode string. Also, it seems like both those strings are same-ish, the Wireshark one is just all formatted as hexadecimals, and the Python one has a mixture of \x escapes and printable characters. — millimoose
– millimoose, Commented Aug 4, 2013 at 12:12

falsetru · Accepted Answer · 2013-08-04 12:11:32Z

4

Use binascii.b2a_hex (or binascii.hexlify).

>>> import binascii
>>> binascii.b2a_hex(b'\x02P\x1cA\xd1\x00\x00\x02\xcb\x11\x00')
b'02501c41d1000002cb1100'
>>> binascii.b2a_hex(b'\x02P\x1cA\xd1\x00\x00\x02\xcb\x11\x00').decode('ascii')
'02501c41d1000002cb1100'

answered Aug 4, 2013 at 12:11

falsetru

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