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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Improve/fix filtering SyntaxWarnings by module","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nSyntax warnings during AST parsing use `_PyCompile_Warn` to setup their warning context automatically. Though the filename is correct, the module is inferred and often not helpful. This is especially an issue when trying to ignore specific errors in a CI environment with pytest where the module is suddenly `importlib._bootstrap`. In other cases with python alone it's often just `sys`.\n\n_AFAICT this applies mainly to the `\"is\" with '...' literal` and `'return' in 'finally' block` warnings._\n\n--\nTo reproduce\n\n```python\n# test.py\nclass A:\n    def __init__(self):\n        self.var = 2\n\n    def func(self) -\u003e bool:\n        return self.var is 2\n```\n```bash\n./python.exe -W error::SyntaxWarning:sys test.py\n```\n```py\n  File \"/.../test.py\", line 7\n    return self.var is 2\n           ^^^^^^^^^^^^^\nSyntaxError: \"is\" with 'int' literal. Did you mean \"==\"?\n```\n\n_Note: The SyntaxWarning is changed to an error for module `sys` where `test` would have been the expected module._\n\n\n--\nThe SyntaxWarning is triggered here:\nhttps://github.com/python/cpython/blob/b14986c91464b06e9016678637e41d0e0192bbe8/Python/codegen.c#L1831-L1837\nhttps://github.com/python/cpython/blob/b14986c91464b06e9016678637e41d0e0192bbe8/Python/compile.c#L1204-L1214\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135829\n* gh-139652\n* gh-140151\n* gh-140240\n* gh-140246\n* gh-140247\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/cdce8p","@type":"Person","name":"cdce8p"},"datePublished":"2025-06-21T22:28:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/135801/cpython/issues/135801"}