Typing Extensions

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Documentation – PyPI

Overview

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, where x.y is the first version that includes all features you need. This is equivalent to typing_extensions >=x.y, <(x+1). Do not depend on ~= x.y.z unless you really know what you're doing; that defeats the purpose of semantic versioning.

Included items

See the documentation for a complete listing of module contents.

Contributing

See CONTRIBUTING.md for how to contribute to typing_extensions.

Project links

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Credits

Author: Guido van Rossum, Jukka Lehtosalo, Łukasz Langa, Michael Lee

GitHub Statistics

Data verified by PyPI on Jul 2, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

PSF-2.0
View SPDX License List

Requires

Python >=3.9

Tags

annotations backport checker checking function hinting hints type typechecking typehinting typehints typing

Classifiers

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