Code in this repository should follow CPython's style guidelines and contributors need to sign the PSF Contributor Agreement.
The typing_extensions module provides a way to access new features from the standard library typing module in older versions of Python. For example, Python 3.10 adds typing.TypeGuard, but users of older versions of Python can use typing_extensions to use TypeGuard in their code even if they are unable to upgrade to Python 3.10.
If you contribute the runtime implementation of a new typing feature to CPython, you are encouraged to also implement the feature in typing_extensions. Because the runtime implementation of much of the infrastructure in the typing module has changed over time, this may require different code for some older Python versions.
typing_extensions may also include experimental features that are not yet part of the standard library, so that users can experiment with them before they are added to the standard library. Such features should already be specified in a PEP or merged into CPython's main branch.
typing_extensions supports Python versions 3.7 and up.
Starting with version 4.0.0, typing_extensions uses Semantic Versioning. See the documentation for more detail.
Make sure you follow the versioning policy in the documentation (e.g., release candidates before any feature release)
Ensure that GitHub Actions reports no errors.
Update the version number in typing_extensions/pyproject.toml and in typing_extensions/CHANGELOG.md.
Make sure your environment is up to date
git checkout main
git pull
python -m pip install --upgrade build twine
Build the source and wheel distributions:
rm -rf dist/python -m build .Install the built distributions locally and test (if you were using tox, you already tested the source distribution).
Run twine upload dist/*.
Tag the release. The tag should be just the version number, e.g. 4.1.1.
git push --tags