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doc/languages-frameworks/python.section.md
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@ -1633,3 +1633,25 @@ would be:
```ShellSession
$ maintainers/scripts/update-python-libraries --target minor --commit --use-pkgs-prefix pkgs/development/python-modules/**/default.nix
```
## CPython Update Schedule
With [PEP 602](https://www.python.org/dev/peps/pep-0602/), CPython now
follows a yearly release cadence. In nixpkgs, all supported interpreters
are made available, but only the most recent two
interpreters package sets are built; this is a compromise between being
the latest interpreter, and what the majority of the Python packages support.
New CPython interpreters are released in October. Generally, it takes some
time for the majority of active Python projects to support the latest stable
interpreter. To help ease the migration for Nixpkgs users
between Python interpreters the schedule below will be used:
| When | Event |
| --- | --- |
| After YY.11 Release | Bump CPython package set window. The latest and previous latest stable should now be built. |
| After YY.05 Release | Bump default CPython interpreter to latest stable. |
In practice, this means that the Python community will have had a stable interpreter
for ~2 months before attempting to update the package set. And this will
allow for ~7 months for Python applications to support the latest interpreter.