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redundant-final-literal (PYI064)

Added in 0.8.0 · Related issues · View source

Derived from the flake8-pyi linter.

Fix is sometimes available.

What it does

Checks for redundant Final[Literal[...]] annotations.

Why is this bad?

All constant variables annotated as Final are understood as implicitly having Literal types by a type checker. As such, a Final[Literal[...]] annotation can often be replaced with a bare Final, annotation, which will have the same meaning to the type checker while being more concise and more readable.

Example

from typing import Final, Literal

x: Final[Literal[42]]
y: Final[Literal[42]] = 42

Use instead:

from typing import Final, Literal

x: Final = 42
y: Final = 42