Provide name suggestions for failed attribute deletions

[Pranjal095]

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-130425: Add "Did you mean" suggestion for del obj.attr #130427
• gh-130425: Add "Did you mean [...]" suggestions for del obj.attr #130799

[StanFromIreland]

Possibly a bug?

[Pranjal095]

It does seem like something obvious that's missing, but I wasn't 100% sure. Anyway, I was able to implement this by checking for deletion errors in PyObject_SetAttr function (Objects/object.c) and accordingly applying _PyObject_SetAttributeErrorContext.
Should I raise the PR?

[sobolevn]

@Pranjal095 thanks for raising this! I suspect that the problem is in a bit different place. I proposed my solution. But, looks like we don't have enough tests for this feature.

Do you want to contribute? :)

[Pranjal095]

I checked out your solution, and yes, it is much more suitable than my proposed change. Glad I could help.
Also, I would love to contribute to the tests for this feature with your guidance!

[StanFromIreland]

Created #130428 for coordination:-)