How to fix error switching code from python2 to python 3

Question

So i'm a streamer trying to make a twitch plays mod, and im struggling with one error to fix. The original source code was written in python 2.7, but im trying to do this in python 3.11. The code is:

    if self.check_has_message(data):
        return [self.parse_message(line) for line in filter(None, data.split('\r\n'))];

gave error code:

typeerror: a bytes-like object is required, not 'str'

I tried doing:

if self.check_has_message(data):

  return [self.parse_message(line) for line in filter(None, data.decode('utf-8').split('\r\n'))];

did not work.

I have no idea what im doing with this tbh but any help is great!

Traceback (most recent call last):

File "D:\twitchplays\wituz\main.py", line 18, in new_messages = t.twitch_recieve_messages(); ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\twitchplays\wituz\twitch.py", line 73, in twitch_recieve_messages return [self.parse_message(line) for line in filter(None, data.split('\r\n'))]; ^^^^^^^^^^^^^^^^^^ TypeError: a bytes-like object is required, not 'str'

Answer 1

Please, learn how to format a literal block. See Cannot split, a bytes-like object is required, not 'str'. The error message is misleading because you are using a string to split a byte array. Change the '\r\n' to b'\r\n'.

>>> b"a\nb".split("\n")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: a bytes-like object is required, not 'str'
>>> b"a\nb".split(b"\n")
[b'a', b'b']

I also recommend learning to add print statements at strategic points in your code to understand what type of object is being operated on. For example:

>>> print(b"a\nb")
b'a\nb'
>>> print("a\nb")
a
b
>>> print(type("a\nb"))
<class 'str'>
>>> print(type(b"a\nb"))
<class 'bytes'>