PyCQA / PyCQA/flake8-pyi

`Y016` doesn't account for single member unions

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#484 3 comments 1 reaction 0 assignees View on GitHub

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type-bug
Dominant language
Python
Stars
83
Forks
22
PR merge metrics
No merged PRs in 30d

Description

For code like:

from typing import Union
x: Union[int, Union[int]]

Y016 should be raised but isn't.

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 reproducing the provided typing example and locating the Y016 implementation and its existing tests. The work is done when this single-member nested Union case is reported as Y016 and the behavior is covered by a regression test.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
tooling
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
45/100

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