typing_extensions 是一个 Python 库，提供对 Python 类型注解的扩展支持，包含在较新 Python 版本中引入的类型功能（如 Literal、TypedDict、Protocol），并将其回溯到旧版本。它是 typing 标准库的补充，广泛 ...

Python's static-typing feature has come a long way since it was introduced in 2014. Adding type information to functions has always been—and will remain—optional, but typing still remains somewhat ...

The documentation for Python's static typing can be found at typing.python.org. You can get help in our support forum. Improvements to the type system should be discussed on Python's Discourse, and ...

Ten years after the introduction of PEP 484, we surveyed the current state of the Python type system and the tools developers are using. This summer, JetBrains, Meta, and Microsoft collaborated to ...

Rename typing_extensions.Sentinel to typing_extensions.sentinel, following the name that has been adopted for builtins.sentinel on Python 3.15. typing_extensions.Sentinel is retained as a ...