1# Typing Extensions 2 3[](https://gitter.im/python/typing) 4 5[Documentation](https://typing-extensions.readthedocs.io/en/latest/#) – 6[PyPI](https://pypi.org/project/typing-extensions/) 7 8## Overview 9 10The `typing_extensions` module serves two related purposes: 11 12- Enable use of new type system features on older Python versions. For example, 13 `typing.TypeGuard` is new in Python 3.10, but `typing_extensions` allows 14 users on previous Python versions to use it too. 15- Enable experimentation with new type system PEPs before they are accepted and 16 added to the `typing` module. 17 18`typing_extensions` is treated specially by static type checkers such as 19mypy and pyright. Objects defined in `typing_extensions` are treated the same 20way as equivalent forms in `typing`. 21 22`typing_extensions` uses 23[Semantic Versioning](https://semver.org/). The 24major version will be incremented only for backwards-incompatible changes. 25Therefore, it's safe to depend 26on `typing_extensions` like this: `typing_extensions >=x.y, <(x+1)`, 27where `x.y` is the first version that includes all features you need. 28 29## Included items 30 31See [the documentation](https://typing-extensions.readthedocs.io/en/latest/#) for a 32complete listing of module contents. 33 34## Contributing 35 36See [CONTRIBUTING.md](https://github.com/python/typing_extensions/blob/main/CONTRIBUTING.md) 37for how to contribute to `typing_extensions`. 38
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