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python39-typing-extensions - Python Typing Extensions
- Description:
The typing_extensions module serves two related purposes:
* Enable use of new type system features on older Python versions.
For example, typing.TypeGuard is new in Python 3.10, but
typing_extensions allows users on previous Python versions to use
it too.
* Enable experimentation with new type system PEPs before they are
accepted and added to the typing module.
typing_extensions is treated specially by static type checkers such as
mypy and pyright. Objects defined in typing_extensions are treated the
same way as equivalent forms in typing.
typing_extensions uses Semantic Versioning. The major version will be
incremented only for backwards-incompatible changes. Therefore, it's
safe to depend on typing_extensions like this: typing_extensions
>=x.y, <(x+1), where x.y is the first version that includes all
features you need.
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