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## Summary This PR detects unparenthesized assignment expressions used in set literals and comprehensions and in sequence indexes. The link to the release notes in https://github.com/astral-sh/ruff/issues/6591 just has this entry: > * Assignment expressions can now be used unparenthesized within set literals and set comprehensions, as well as in sequence indexes (but not slices). with no other information, so hopefully the test cases I came up with cover all of the changes. I also tested these out in the Python REPL and they actually worked in Python 3.9 too. I'm guessing this may be another case that was "formally made part of the language spec in Python 3.10, but usable -- and commonly used -- in Python >=3.9" as @AlexWaygood added to the body of #6591 for context managers. So we may want to change the version cutoff, but I've gone along with the release notes for now. ## Test Plan New inline parser tests and linter CLI tests. |
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Ruff Python Parser
Ruff's Python parser is a hand-written recursive descent parser which can parse Python source code into an Abstract Syntax Tree (AST). It also utilizes the Pratt parsing technique to parse expressions with different precedence.
Try out the parser in the playground.
Python version support
The parser supports the latest Python syntax, which is currently Python 3.12.
It does not throw syntax errors if it encounters a syntax feature that is not
supported by the target-version.
This will be fixed in a future release (see https://github.com/astral-sh/ruff/issues/6591).
Contributing
Refer to the contributing guidelines to get started and GitHub issues with the parser label for issues that need help.