\item[(3)] Raises \exception{ValueError} when \var{x} is not found in
\var{s}.
-\item[(4)] The \method{pop()} method is experimental and at the moment
- only supported by the list and array types. The optional argument
- \var{i} defaults to \code{-1}, so that by default the last item is
- removed and returned.
+\item[(4)] The \method{pop()} method only supported by the list and
+ array types. The optional argument \var{i} defaults to \code{-1},
+ so that by default the last item is removed and returned.
\item[(5)] The \method{sort()} and \method{reverse()} methods modify the
list in place for economy of space when sorting or reversing a large