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Summary -- Detect setting or deleting `__debug__`. Assigning to `__debug__` was a `SyntaxError` on the earliest version I tested (3.8). Deleting `__debug__` was made a `SyntaxError` in [BPO 45000], which said it was resolved in Python 3.10. However, `del __debug__` was also a runtime error (`NameError`) when I tested in Python 3.9.6, so I thought it was worth including 3.9 in this check. I don't think it was ever a *good* idea to try `del __debug__`, so I think there's also an argument for not making this version-dependent at all. That would only simplify the implementation very slightly, though. [BPO 45000]: https://github.com/python/cpython/issues/89163 Test Plan -- New inline tests. This also required adding a `PythonVersion` field to the `TestContext` that could be taken from the inline `ParseOptions` and making the version field on the options accessible. |
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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.