unaliased-collections-abc-set-import (PYI025)

Derived from the flake8-pyi linter.

Fix is sometimes available.

What it does

Checks for from collections.abc import Set imports that do not alias Set to AbstractSet.

Why is this bad?

The Set type in collections.abc is an abstract base class for set-like types. It is easily confused with, and not equivalent to, the set builtin.

To avoid confusion, Set should be aliased to AbstractSet when imported. This makes it clear that the imported type is an abstract base class, and not the set builtin.

Example

from collections.abc import Set

Use instead:

from collections.abc import Set as AbstractSet