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unused-function-argument not silenced by prefixed underscore if variable name is "ๆฌก"ย #28721
Description
Summary
In a lambda function or a FunctionDef, a "variable is intentionally defined-but-not-used [and] ... prefixed with an underscore," but Ruff emits unused-lambda-argument (ARG005) or unused-function-argument (ARG001).
The variable name is ๆฌก. If I change the name to ci or a, the underscore prevents the diagnostic emission.
from operator import sub
from fraction import Fraction
def difference(previous: tuple[Fraction, ...], _ๆฌก: int) -> tuple[Fraction, ...]:
return tuple(map(sub, previous[1:], previous[:-1]))
q = lambda previous, _ๆฌก: tuple(map(sub, previous[1:], previous[:-1]))
def differenceLatin(previous: tuple[Fraction, ...], _ci: int) -> tuple[Fraction, ...]:
return tuple(map(sub, previous[1:], previous[:-1]))
qLatin = lambda previous, _ci: tuple(map(sub, previous[1:], previous[:-1]))preview = false
builtins = []
target-version = "py310"
line-length = 88
indent-width = 4
[lint]
allowed-confusables = []
dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
extend-select = []
extend-fixable = []
external = []
ignore = []
select = [ "ARG", "ASYNC100", "ASYNC105", "ASYNC115", "ASYNC116", "ASYNC210", "ASYNC220", "ASYNC221", "ASYNC222", "ASYNC230", "ASYNC251", "B002", "B003", "B004", "B005", "B006", "B008", "B009", "B010", "B012", "B013", "B014", "B015", "B016", "B017", "B018", "B019", "B020", "B021", "B022", "B023", "B025", "B026", "B029", "B030", "B031", "B032", "B033", "B035", "B039", "BLE001", "C400", "C401", "C402", "C403", "C404", "C405", "C406", "C408", "C409", "C410", "C411", "C413", "C414", "C415", "C417", "C418", "C419", "D419", "DTZ001", "DTZ002", "DTZ003", "DTZ004", "DTZ005", "DTZ006", "DTZ007", "DTZ011", "DTZ012", "DTZ901", "E722", "E902", "EXE001", "EXE002", "EXE004", "EXE005", "F401", "F402", "F404", "F407", "F501", "F502", "F503", "F504", "F505", "F506", "F507", "F508", "F509", "F521", "F522", "F523", "F524", "F525", "F541", "F601", "F602", "F621", "F622", "F631", "F632", "F633", "F634", "F701", "F702", "F704", "F706", "F707", "F811", "F821", "F822", "F823", "F841", "F842", "F901", "FA100", "FA102", "FLY002", "FURB105", "FURB122", "FURB129", "FURB132", "FURB136", "FURB157", "FURB161", "FURB162", "FURB163", "FURB166", "FURB167", "FURB168", "FURB169", "FURB177", "FURB181", "FURB188", "FURB192", "G010", "G101", "G201", "G202", "I001", "INT001", "INT002", "INT003", "ISC004", "LOG001", "LOG002", "LOG009", "LOG014", "LOG015", "N999", "PERF101", "PERF102", "PERF402", "PGH005", "PIE790", "PIE794", "PIE796", "PIE800", "PIE804", "PIE807", "PIE808", "PIE810", "PLC0105", "PLC0131", "PLC0132", "PLC0205", "PLC0206", "PLC0208", "PLC0414", "PLC3002", "PLE0100", "PLE0101", "PLE0115", "PLE0116", "PLE0117", "PLE0118", "PLE0303", "PLE0304", "PLE0305", "PLE0307", "PLE0308", "PLE0309", "PLE0604", "PLE0605", "PLE0643", "PLE0704", "PLE1132", "PLE1142", "PLE1205", "PLE1206", "PLE1300", "PLE1307", "PLE1310", "PLE1507", "PLE1519", "PLE1520", "PLE1700", "PLE2502", "PLE2510", "PLE2512", "PLE2513", "PLE2514", "PLE2515", "PLR0124", "PLR0133", "PLR0206", "PLR0402", "PLR1704", "PLR1708", "PLR1711", "PLR1716", "PLR1722", "PLR1730", "PLR1733", "PLR1736", "PLR2044", "PLW0120", "PLW0127", "PLW0128", "PLW0129", "PLW0131", "PLW0133", "PLW0177", "PLW0211", "PLW0245", "PLW0406", "PLW0602", "PLW0604", "PLW0642", "PLW0711", "PLW1501", "PLW1507", "PLW1508", "PLW1509", "PLW1510", "PLW2101", "PT010", "PT014", "PT020", "PT025", "PT026", "PT031", "PTH124", "PTH210", "PYI001", "PYI002", "PYI003", "PYI004", "PYI005", "PYI006", "PYI007", "PYI008", "PYI009", "PYI010", "PYI012", "PYI013", "PYI015", "PYI016", "PYI017", "PYI018", "PYI019", "PYI020", "PYI025", "PYI026", "PYI029", "PYI030", "PYI032", "PYI033", "PYI034", "PYI035", "PYI036", "PYI041", "PYI042", "PYI043", "PYI044", "PYI045", "PYI046", "PYI047", "PYI048", "PYI049", "PYI050", "PYI052", "PYI055", "PYI057", "PYI058", "PYI059", "PYI061", "PYI062", "PYI063", "PYI064", "PYI066", "RET501", "RUF007", "RUF008", "RUF009", "RUF010", "RUF012", "RUF013", "RUF015", "RUF016", "RUF017", "RUF018", "RUF019", "RUF020", "RUF022", "RUF023", "RUF024", "RUF026", "RUF028", "RUF030", "RUF032", "RUF033", "RUF034", "RUF040", "RUF041", "RUF046", "RUF048", "RUF049", "RUF051", "RUF053", "RUF057", "RUF058", "RUF059", "RUF063", "RUF068", "RUF100", "RUF101", "RUF200", "S102", "S110", "S112", "SIM101", "SIM102", "SIM103", "SIM107", "SIM113", "SIM114", "SIM115", "SIM117", "SIM118", "SIM201", "SIM202", "SIM208", "SIM210", "SIM211", "SIM220", "SIM221", "SIM222", "SIM223", "SIM401", "SIM905", "SIM911", "T100", "TC004", "TC005", "TC007", "TC010", "TRY002", "TRY004", "TRY201", "TRY203", "TRY401", "UP001", "UP003", "UP004", "UP005", "UP006", "UP007", "UP008", "UP009", "UP010", "UP011", "UP012", "UP014", "UP017", "UP018", "UP019", "UP020", "UP021", "UP022", "UP023", "UP024", "UP025", "UP026", "UP028", "UP029", "UP030", "UP031", "UP032", "UP033", "UP034", "UP035", "UP036", "UP037", "UP039", "UP040", "UP041", "UP043", "UP044", "UP045", "UP046", "UP047", "UP049", "UP050", "W605", "YTT101", "YTT102", "YTT103", "YTT201", "YTT202", "YTT203", "YTT204", "YTT301", "YTT302", "YTT303" ]
[format]
indent-style = "space"
quote-style = "double"Version
ruff 0.16.8 (62914c4 2026-09-16)
Activity
MichaReiser commentedon Sep 19, 2026
The issue is that our default Regex only matches ASCII identifiers
[ruff] Support Unicode dummy variable names (#28722)
AlexWaygood commentedon Sep 22, 2026
fixed in #28722
[ruff] Support Unicode dummy variable names (#28722)
[ruff] Support Unicode dummy variable names (#28722)
[ruff] Support Unicode dummy variable names (#28722)
[ruff] Support Unicode dummy variable names (#28722)
[ruff] Support Unicode dummy variable names (#28722)