Extend F507 to flag %-format strings with zero placeholders#24215
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MichaReiser merged 2 commits intoastral-sh:mainfrom Mar 27, 2026
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* main: (40 commits) [ty] resolve union-likes in emitting union attribute errors (#24263) [ty] Improve support for `Callable` type context (#23888) [ty] Propagate type context through `await` expressions (#24256) [`pyflakes`] Flag annotated variable redeclarations as `F811` in preview mode (#24244) [ty] Preserve `Divergent` when materializing recursive aliases (#24245) Fix W391 fixes for consecutive empty notebook cells (#24236) [flake8-bugbear] Clarify RUF071 fix safety for non-path string comparisons (#24149) [ty] Ban type qualifiers in PEP-695 type aliases (#24242) [ty] Include keyword-prefixed symbols in completions for attributes (#24232) [ty] Add tests for TypedDict method overloads on unions (#24230) [ty] report unused bindings as unnecessary hint diagnostics (#23305) Remove unused `non_root` variable (#24238) Extend F507 to flag %-format strings with zero placeholders (#24215) [`flake8-simplify`] Suppress `SIM105` for `except*` before Python 3.12 (#23869) Ignore pre-initialization references in SIM113 (#24235) Parenthesize expression in RUF050 fix (#24234) Publish playgrounds using the `release-playground` environment (#24223) [ty] Fix instance-attribute lookup in methods of protocol classes (#24213) [ty] Used shared expression cache during generic call inference (#24219) [ty] make `Type::BoundMethod` include instances of same-named methods bound to a subclass (#24039) ...
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Summary
"hello" % xwhere the format string has no placeholders, since this is almost certainly a bug (only()would succeed at runtime)'hello' % banana— flagged'' % banana— flagged'hello' % unknown_var— flagged (unknown variables now caught too)'hello' % get_value()— flagged (function calls now caught too)'hello' % obj.attr— flagged (attribute access now caught too)'hello' % ()— not flagged (empty tuple is the only valid case)Test plan
'hello' % ()(empty tuple) is correctly not flaggedCloses #24164