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Typing Extensions – Backported and Experimental Type Hints for Python
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.
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