PEP 484
The Python proposal that specifies type hints, defining the standard syntax and tools for type annotations.
Timeline (last 90 days)
Python type hints (introduced starting with PEP 484) initially only served static checking tools and IDE completion, and are not enforced at runtime.
PEP 484 provides tools such as typing.Literal, typing.Final and typing.TypeGuard to describe special values.
Representative implementations of gradual typing include TypeScript, Python's type annotations (PEP 484) and Flow.
Mapped[] 是 SQLAlchemy 2.0 引入的声明式类型注解语法，基于 Python 的 PEP 484 类型系统
All Facts (4)
Python type hints (introduced starting with PEP 484) initially only served static checking tools and IDE completion, and are not enforced at runtime.
50%UnverifiedPEP 484 provides tools such as typing.Literal, typing.Final and typing.TypeGuard to describe special values.
50%UnverifiedRepresentative implementations of gradual typing include TypeScript, Python's type annotations (PEP 484) and Flow.
50%UnverifiedMapped[] 是 SQLAlchemy 2.0 引入的声明式类型注解语法，基于 Python 的 PEP 484 类型系统
50%