python / python/mypy

Add support for more forms of computed `__all__`

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#15,300 3 comments 2 reactions 0 assignees View on GitHub

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feature
Dominant language
Python
Stars
20.6k
Forks
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PR merge metrics
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Description

Feature
Add typing support for the following forms of computing __all__:

__all__ += ['a', b']
__all__ += submodule.__all__
__all__.extend(submodule.__all__)

Pitch
Combining __all__ from multiple submodules is a common and useful pattern.

Related: https://github.com/python/mypy/issues/12582

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

The issue names three unsupported forms of computed all, but no implementation files or tests. Start by locating mypy's existing handling and tests for computed all, then reproduce each listed form. Done means all three forms receive the intended typing support with regression coverage.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
devtools
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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