.. Patch #1490190
+* :class:`mmap` objects now have a :meth:`rfind` method that finds
+ a substring, beginning at the end of the string and searching
+ backwards. The :meth:`find` method
+ also gained a *end* parameter containing the index at which to stop
+ the forward search.
+ (Contributed by John Lenton.)
+
* The :mod:`new` module has been removed from Python 3.0.
Importing it therefore
triggers a warning message when Python is running in 3.0-warning