Question 1

How do I use RightTyper with pytest to infer types from my tests?

Accepted Answer

Run `python3 -m righttyper -m pytest [your test args]`; it monitors execution during tests, infers types, and annotates source files while automatically excluding test-specific types like mocks.

Question 2

RightTyper vs MonkeyType: which is better for automatic Python type annotations?

Accepted Answer

RightTyper is significantly faster with ~25% overhead vs MonkeyType's 41x slowdown, and offers advanced features like tensor shape inference. However, MonkeyType might be preferred for projects on older Python versions, as RightTyper requires 3.12+.

Question 3

Can RightTyper handle async functions and generators?

Accepted Answer

Yes, it properly infers Generator and AsyncGenerator types, including send protocols, by monitoring their execution and return values during runtime, as detailed in the language support section.

Question 4

Does RightTyper work with dataclasses and attrs classes?

Accepted Answer

Yes, it infers field types for dataclasses, attrs classes, and NamedTuples by observing their __init__ calls during execution, and preserves annotations like ClassVar when updating existing types.

Question 5

How to avoid mocks from tests appearing in RightTyper annotations?

Accepted Answer

RightTyper automatically excludes types from test modules, but you can fine-tune this with flags like --exclude-test-types and --resolve-mocks to ensure clean annotations without manual intervention.

Question 6

What's the performance impact of RightTyper on a large codebase?

Accepted Answer

On average, it adds 25% runtime overhead, but this varies; for instance, on the 'black' formatter, it's 50% overhead. You can adjust sampling rates with --poisson-rate to balance performance and accuracy.

RightTyper

What is RightTyper?

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