The error message from `codecs.register_error()` and `str.encode()` should be clearer

[hyperkai]

Bug report

Bug description:

I registered the error handler returning a wrong value to codecs.register_error(), then using it with str.encode() gets the less clear error message as shown below:

import codecs

def my_error_handler(s):
    return ("ok",)

codecs.register_error('original_handler', my_error_handler)

v = 'pythön!'

print(v.encode(encoding='ascii', errors='original_handler'))
# TypeError: encoding error handler must return (str/bytes, int) tuple

So, the error message should be clearer like below:

TypeError: encoding error handler must return a tuple of two elements (str/bytes, int)

CPython versions tested on:

3.13

Operating systems tested on:

Windows

[skirpichev]

I am not a native English speaker, but current error message looks fine for me.

[picnixz]

I also think the error is sufficiently clear. Thanks but I'll close this one as wont fix