Decide what to do about variance and self types

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
20/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
compilers

Research direction

Start by reading the discussion in issue #2193 and the linked comment on pull request #2193. Determine whether covariant self types are supported and what their semantics should be; done means the project has a clear, agreed decision and the issue's outcome is recorded.

Written by the indexing model from the issue text.

Description

priority-2-low topic-self-types

As per the discussion in #2193, it's unclear whether 'self types' (self with a type variable type) can be covariant, or if they are, what that should it mean.

A relevant comment (but there are others): https://github.com/python/mypy/pull/2193#issuecomment-255150149

Dominant language
Python
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Avg merge
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Merged PRs (30d)
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Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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