Note that, as of Python 1.6, the .returns_unicode attribute on parser

objects can be modified at any point with the expected results.

Doc/lib/libpyexpat.tex

@@ -119,6 +119,8 @@ Returns a string containing the base set by a previous call to
 If this attribute is set to 1, the handler functions will be passed
 Unicode strings.  If \member{returns_unicode} is 0, 8-bit strings
 containing UTF-8 encoded data will be passed to the handlers.
+\versionchanged[Can be changed at any time to affect the result
+  type.]{1.6}
 \end{memberdesc}
 
 The following attributes contain values relating to the most recent