Nit in _IS_BLANK_OR_COMMENT comment -- it doesn't matter how this is
implemented, just what it does.
diff --git a/Lib/doctest.py b/Lib/doctest.py
index a98df1a..fe23064 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -497,8 +497,8 @@
)*)
''', re.MULTILINE | re.VERBOSE)
- # This regular expression matcher checks if a given string is a
- # blank line or contains a single comment.
+ # A callable returning a true value iff its argument is a blank line
+ # or contains a single comment.
_IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match
def get_doctest(self, string, globs, name, filename, lineno):