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What does typing.Self do and why does it beat TypeVar for methods?

Q: What does typing.Self do and why does it beat TypeVar for methods?

`Self` (3.11, PEP 673) means 'the type of `self`/`cls`' without a boilerplate TypeVar; it preserves subclass types through chaining. TypeVar boilerplate Self: one word | | TypeVar pattern | Self | |---|---|---| | Declaration | `T = TypeVar('T', bound='Base')` + `def clone(self: T) -> T` | `def clone(self) -> Self` | | Subclass return | Works but verbose | Works, concise | | Classmethod | `def create(cls: type[T]) -> T` | `def create(cls) -> Self` | | Readability | Noisy | Idiomatic 3.11+ | Use `Self` for any method r

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PEP 673 Self for fluent APIs and subclass-preserving returns.

typingselfpython3.11

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Self (3.11, PEP 673) means 'the type of self/cls' without a boilerplate TypeVar; it preserves subclass types through chaining.

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