Provide name suggestions for failed attribute deletions

Feature or enhancement

Proposal:

This was initially mentioned as a comment in issue #130399.

class A:
    pass

a = A()
a.abcde = 1
del a.abcdf # typo

Current Output

Traceback (most recent call last):
  File "<python-input-0>", line 6, in <module>
    del a.abcdf # typo
        ^^^^^^^
AttributeError: 'A' object has no attribute 'abcdf'

CPython provides name suggestions when an attribute lookup (obj.attr) fails, but it does not provide similar suggestions when an attribute deletion (del obj.attr) fails. This brings about an inconsistency with regards to the developer experience offered by the language.

Expected Output

Traceback (most recent call last):
  File "<python-input-0>", line 6, in <module>
    del a.abcdf # typo
        ^^^^^^^
AttributeError: 'A' object has no attribute 'abcdf'. Did you mean: 'abcde'?

Advantages

• Helps users quickly identify typos in attribute deletions.
• CPython already provides name suggestions for failed attribute lookups (obj.attr), so deletions (del obj.attr) should behave similarly.
• Suggestions are only generated when an attribute deletion fails, and hence has a minimal performance impact.

Note
CPython version - CPython main branch
Operating system - Ubuntu 22.04

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-130427
• gh-130799
• gh-136588

The issue does not name files or tests. Start by comparing the existing name-suggestion behavior for failed attribute lookup with the failed del obj.attr path, then locate the relevant CPython tests for AttributeError suggestions. Done means a misspelled attribute deletion includes the closest name suggestion without changing the existing lookup behavior.