New stuff by AMK.

Doc/libwhichdb.tex

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+\section{Standard Module \sectcode{whichdb}}
+\stmodindex{whichdb}
+
+The single function in this module attempts to guess which of the
+several simple database modules available--dbm, gdbm, or
+dbhash--should be used to open a given file.
+
+\renewcommand{\indexsubitem}{(in module whichdb)}
+\begin{funcdesc}{whichdb}{filename}
+Returns one of the following values: \code{None} if the file can't be
+opened because it's unreadable or doesn't exist; the empty string
+(\code{""}) if the file's format can't be guessed; or a string
+containing the required module name, such as \code{"dbm"} or
+\code{"gdbm"}.
+\end{funcdesc}
+