Suggest type annotations for partial types spanning multiple scopes

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
compilers

Research direction

Start by reading the fine-grained incremental mode work in issue #4553 and the original discussion in issue #4492, especially the linked comment. Determine the common cases where partial types span multiple scopes, then define and implement annotation suggestions whose output can be validated against those cases.

Written by the indexing model from the issue text.

Description

feature priority-2-low topic-fine-grained-incremental

We don't support inferring partial types from multiple scopes in fine-grained incremental mode (#4553), but this works in other modes. Migrating to fine-grained incremental mode will often require adding some annotations. It would make sense to automatically generate suggestions for the type annotations (at least in many common cases) to simplify the migration.

Original issue with discussion: #4492, especially https://github.com/python/mypy/issues/4492#issuecomment-360915585

Dominant language
Python
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Merged PRs (30d)
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