88c0ce3e38
Summary -- Closes #19467 and also removes the warning about using Python 3.14 without preview enabled. I also bumped `PythonVersion::default` to 3.9 because it reaches EOL this month, but we could also defer that for now if we wanted. The first three commits are related to the `latest` bump to 3.14; the fourth commit bumps the default to 3.10. Note that this PR also bumps the default Python version for ty to 3.10 because there was a test asserting that it stays in sync with `ast::PythonVersion`. Test Plan -- Existing tests I spot-checked the ecosystem report, and I believe these are all expected. Inbits doesn't specify a target Python version, so I guess we're applying the default. UP007, UP035, and UP045 all use the new default value to emit new diagnostics.
Ruff Formatter
The Ruff formatter is an extremely fast Python code formatter that ships as part of the ruff
CLI.
Goals
The formatter is designed to be a drop-in replacement for Black, but with an excessive focus on performance and direct integration with Ruff.
Specifically, the formatter is intended to emit near-identical output when run over Black-formatted code. When run over extensive Black-formatted projects like Django and Zulip, > 99.9% of lines are formatted identically. When migrating an existing project from Black to Ruff, you should expect to see a few differences on the margins, but the vast majority of your code should be unchanged.
If you identify deviations in your project, spot-check them against the intentional deviations enumerated below, as well as the unintentional deviations filed in the issue tracker. If you've identified a new deviation, please file an issue.
When run over non-Black-formatted code, the formatter makes some different decisions than Black, and so more deviations should be expected, especially around the treatment of end-of-line comments. For details, see Style Guide.
Getting started
Head to The Ruff Formatter for usage instructions and a comparison to Black.