python / python/cpython

Improve UX by using fully-qualified name in some `TypeError`

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interpreter-core type-feature
Dominant language
Python
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Description

Feature or enhancement

Proposal:

The error message TypeError: Can't instantiate abstract class FOO without an implementation for abstract methods 'BAR' doesn't tell me with module FOO comes from.

This is unfortunate, particularly in larger code bases where several FOO-ish classes live in distinct modules but have the same local name: discovering which class triggered the problem may require nontrivial code analysis.

Thus I propose to extend this error message so that it reports the module name, i.e. abstract class BAZ.BAR.FOO, instead.

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-156683

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Research direction

The issue identifies the abstract-class TypeError message as the entry point; review linked PR gh-156683 first to see the current proposed scope. Confirm the finished behavior reports the class's module-qualified name in this error without losing the abstract-method details.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
25/100

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