diff --git a/btest b/btest
index b14ada6..9e82222 100755
--- a/btest
+++ b/btest
@@ -3169,17 +3169,17 @@ if __name__ == "__main__":
     # Commands as tuple (tag, regexp, more-than-one-is-ok, optional, group-main, group-add)
     # pylint: disable=bad-whitespace
     # fmt: off
-    RE_EXEC                = ("exec",            re.compile(CommandPrefix + "EXEC(-FAIL)?: *(.*)"), True, False, 2, 1) # noqa
-    RE_REQUIRES            = ("requires",        re.compile(CommandPrefix + "REQUIRES: *(.*)"), True, True, 1, -1) # noqa
-    RE_GROUP               = ("group",           re.compile(CommandPrefix + "GROUP: *(.*)"), True, True, 1, -1) # noqa
-    RE_SERIALIZE           = ("serialize",       re.compile(CommandPrefix + "SERIALIZE: *(.*)"), False, True, 1, -1) # noqa
-    RE_PORT                = ("port",            re.compile(CommandPrefix + "PORT: *(.*)"), True, True, 1, -1) # noqa
-    RE_INCLUDE_ALTERNATIVE = ("alternative",     re.compile(CommandPrefix + "ALTERNATIVE: *(.*)"), True, True, 1, -1) # noqa
-    RE_IGNORE_ALTERNATIVE  = ("not-alternative", re.compile(CommandPrefix + "NOT-ALTERNATIVE: *(.*)"), True, True, 1, -1) # noqa
-    RE_COPY_FILE           = ("copy-file",       re.compile(CommandPrefix + "COPY-FILE: *(.*)"), True, True, 1, -1) # noqa
-    RE_KNOWN_FAILURE       = ("known-failure",   re.compile(CommandPrefix + "KNOWN-FAILURE"), False, True, -1, -1) # noqa
-    RE_MEASURE_TIME        = ("measure-time",    re.compile(CommandPrefix + "MEASURE-TIME"), False, True, -1, -1) # noqa
-    RE_DOC                 = ("doc",             re.compile(CommandPrefix + "DOC: *(.*)"), True, True, 1, -1) # noqa
+    RE_EXEC                = ("exec",            re.compile(CommandPrefix + "EXEC(-FAIL)?: *(.*)"), True, False, 2, 1)
+    RE_REQUIRES            = ("requires",        re.compile(CommandPrefix + "REQUIRES: *(.*)"), True, True, 1, -1)
+    RE_GROUP               = ("group",           re.compile(CommandPrefix + "GROUP: *(.*)"), True, True, 1, -1)
+    RE_SERIALIZE           = ("serialize",       re.compile(CommandPrefix + "SERIALIZE: *(.*)"), False, True, 1, -1)
+    RE_PORT                = ("port",            re.compile(CommandPrefix + "PORT: *(.*)"), True, True, 1, -1)
+    RE_INCLUDE_ALTERNATIVE = ("alternative",     re.compile(CommandPrefix + "ALTERNATIVE: *(.*)"), True, True, 1, -1)
+    RE_IGNORE_ALTERNATIVE  = ("not-alternative", re.compile(CommandPrefix + "NOT-ALTERNATIVE: *(.*)"), True, True, 1, -1)
+    RE_COPY_FILE           = ("copy-file",       re.compile(CommandPrefix + "COPY-FILE: *(.*)"), True, True, 1, -1)
+    RE_KNOWN_FAILURE       = ("known-failure",   re.compile(CommandPrefix + "KNOWN-FAILURE"), False, True, -1, -1)
+    RE_MEASURE_TIME        = ("measure-time",    re.compile(CommandPrefix + "MEASURE-TIME"), False, True, -1, -1)
+    RE_DOC                 = ("doc",             re.compile(CommandPrefix + "DOC: *(.*)"), True, True, 1, -1)
     # fmt: on
     # pylint: enable=bad-whitespace
 
diff --git a/examples/sphinx/conf.py b/examples/sphinx/conf.py
index 4d56f7c..a7248d9 100644
--- a/examples/sphinx/conf.py
+++ b/examples/sphinx/conf.py
@@ -10,7 +10,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys, os
+import sys
 
 sys.path.append("../../sphinx")
 sys.path.append("../../../sphinx")
diff --git a/pyproject.toml b/pyproject.toml
index 8dbf689..d1a6325 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,4 +72,4 @@ per-file-ignores = """
 """
 
 [tool.ruff.lint]
-select = ["C4", "COM", "F", "I", "UP"]
+select = ["C4", "COM", "F", "I", "ISC", "UP"]