bytearray.extend: Misleading error message

[smurfix]

Bug description:

b=bytearray(b"abc")
b.extend('def')

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'str' object cannot be interpreted as an integer```

… except that bytes.extend doesn't even accept integers as arguments; the error refers to the first element of the string, which happens also to be a string in Python. Meh.

Could CPython please complain about requiring the string to be encoded instead?

CPython versions tested on:

main branch

Operating systems tested on:

Linux

Linked PRs

• gh-115323: Add meaningful error message for using bytearray.extend with str #115332
• [3.12] gh-115323: Add meaningful error message for using bytearray.extend with str (GH-115332) #115894
• [3.11] gh-115323: Add meaningful error message for using bytearray.extend with str (GH-115332) #115895

[terryjreedy]

Behavior same back to 3.11. The currently message is erroneous enough that backporting should be considered.

[terryjreedy]

After adding the backport tags and having them start, I changed my mind and closed them.