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 ideally already be specified in a PEP or draft PEP.
typing_extensions still supports all Python versions supported by typing, down to Python 2.7 and 3.4. However, it is OK to omit support for Python versions that have reached end of life if doing so is too difficult or otherwise does not make sense. For example, typing_extensions.AsyncGenerator only exists on Python 3.6 and higher, because async generators were added to the language in 3.6.
The version number of typing_extensions indicates the version of the standard library typing module that is reflected in the backport. For example, typing_extensions version 3.10.0.0 includes features from the Python 3.10.0 standard library‘s typing module. A new release that doesn’t include any new standard library features would be called 3.10.0.1.
Ensure that GitHub Actions reports no errors.
Update the version number in setup.py.
Build the source and wheel distributions:
pip3 install -U setuptools wheelpip2 install -U setuptools wheelrm -rf dist/ build/python3 setup.py sdist bdist_wheelrm -rf build/ (Works around a Wheel bug <https://bitbucket.org/pypa/wheel/issues/147/bdist_wheel-should-start-by-cleaning-up>_)python2 setup.py bdist_wheelInstall the built distributions locally and test (if you were using tox, you already tested the source distribution).
Make sure twine is up to date, then run twine upload dist/*.