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<title>7.12 whichdb -- Guess which DBM module created a database</title>
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<H1><A NAME="SECTION0091200000000000000000">
7.12 <tt class="module">whichdb</tt> --
         Guess which DBM module created a database</A>
</H1>

<P>
<A NAME="module-whichdb"></A>

<P>
The single function in this module attempts to guess which of the
several simple database modules available-<tt class="module"><a href="module-dbm.html">dbm</a></tt>,
<tt class="module"><a href="module-gdbm.html">gdbm</a></tt>, or <tt class="module"><a href="module-dbhash.html">dbhash</a></tt>-should be used to open a
given file.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2795' xml:id='l2h-2795' class="function">whichdb</tt></b>(</nobr></td>
  <td><var>filename</var>)</td></tr></table></dt>
<dd>
Returns one of the following values: <code>None</code> if the file can't be
opened because it's unreadable or doesn't exist; the empty string
(<code>''</code>) if the file's format can't be guessed; or a string
containing the required module name, such as <code>'dbm'</code> or
<code>'gdbm'</code>.
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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