duplicate-union-member (PYI016)

Derived from the flake8-pyi linter.

Fix is sometimes available.

What it does

Checks for duplicate union members.

Why is this bad?

Duplicate union members are redundant and should be removed.

Example

foo: str | str

Use instead:

foo: str

Fix safety

This rule's fix is marked as safe unless the union contains comments.

For nested union, the fix will flatten type expressions into a single top-level union.

References

• Python documentation: typing.Union