`Final` symbol without a value

What it does

Checks for Final symbols that are declared without a value and are never assigned a value in their scope.

Why is this bad?

A Final symbol must be initialized with a value at the time of declaration or in a subsequent assignment. At module or function scope, the assignment must occur in the same scope. In a class body, the assignment may occur in __init__.

Examples

from typing import Final

# `Final` symbol without a value
MY_CONSTANT: Final[int]  # error

# OK: `Final` symbol with a value
INITIALIZED_CONSTANT: Final[int] = 1