non-empty-stub-body (PYI010)

Derived from the flake8-pyi linter.

Fix is always available.

What it does

Checks for non-empty function stub bodies.

Why is this bad?

Stub files are never executed at runtime; they should be thought of as "data files" for type checkers or IDEs. Function bodies are redundant for this purpose.

Example

def double(x: int) -> int:
    return x * 2

Use instead:

def double(x: int) -> int: ...

References

• The recommended style for stub functions and methods in the typing docs.