Note that the mimetypes.MimeTypes class was added in Python 2.2.

freddrake · freddrake · commit b3cc29b4934e · 2001-08-04T00:48:49.000Z
diff --git a/Doc/lib/libmimetypes.tex b/Doc/lib/libmimetypes.tex
@@ -113,6 +113,8 @@ \section{\module{mimetypes} ---
 
   The optional \var{filenames} parameter can be used to cause
   additional files to be loaded ``on top'' of the default database.
+
+  \versionadded{2.2}
 \end{classdesc}
 
 
