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missing-return-type-private-function (ANN202)#

Derived from the flake8-annotations linter.

Fix is sometimes available.

What it does#

Checks that private functions and methods have return type annotations.

Why is this bad?#

Type annotations are a good way to document the return types of functions. They also help catch bugs, when used alongside a type checker, by ensuring that the types of any returned values, and the types expected by callers, match expectation.


def _add(a, b):
    return a + b

Use instead:

def _add(a: int, b: int) -> int:
    return a + b