python / python/mypy

Enable two-phase checking in sequential mode when --local-partial-types is set

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parallel checking
Dominant language
Python
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Description

Right now there may be minor inconsistencies between sequential and parallel mode, because the latter uses two-phase checking (interfaces, then implementations). We should (gradually) switch sequential mode to the two-phase checking as well.

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.

Research direction

Start by tracing sequential mode when --local-partial-types is set, then compare its checking flow with parallel mode’s two phases: interfaces followed by implementations. Identify the relevant checker entry points and tests; done means sequential mode uses two-phase checking under that flag while unrelated modes retain their current behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
compilers
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
42/100

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