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<div class="section" id="module-whichdb">
<span id="whichdb-guess-which-dbm-module-created-a-database"></span><h1>11.7. <a class="reference internal" href="#module-whichdb" title="whichdb: Guess which DBM-style module created a given database."><code class="xref py py-mod docutils literal notranslate"><span class="pre">whichdb</span></code></a> — Guess which DBM module created a database<a class="headerlink" href="#module-whichdb" title="Permalink to this headline">¶</a></h1>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <a class="reference internal" href="#module-whichdb" title="whichdb: Guess which DBM-style module created a given database."><code class="xref py py-mod docutils literal notranslate"><span class="pre">whichdb</span></code></a> module’s only function has been put into the <a class="reference internal" href="dbm.html#module-dbm" title="dbm: The standard "database" interface, based on ndbm. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">dbm</span></code></a>
module in Python 3. The <a class="reference internal" href="../glossary.html#term-2to3"><span class="xref std std-term">2to3</span></a> tool will automatically adapt imports
when converting your sources to Python 3.</p>
</div>
<p>The single function in this module attempts to guess which of the several simple
database modules available—<a class="reference internal" href="dbm.html#module-dbm" title="dbm: The standard "database" interface, based on ndbm. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">dbm</span></code></a>, <a class="reference internal" href="gdbm.html#module-gdbm" title="gdbm: GNU's reinterpretation of dbm. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gdbm</span></code></a>, or <a class="reference internal" href="dbhash.html#module-dbhash" title="dbhash: DBM-style interface to the BSD database library."><code class="xref py py-mod docutils literal notranslate"><span class="pre">dbhash</span></code></a>—should be used to open a given file.</p>
<dl class="function">
<dt id="whichdb.whichdb">
<code class="descclassname">whichdb.</code><code class="descname">whichdb</code><span class="sig-paren">(</span><em>filename</em><span class="sig-paren">)</span><a class="headerlink" href="#whichdb.whichdb" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns one of the following values: <code class="docutils literal notranslate"><span class="pre">None</span></code> if the file can’t be opened
because it’s unreadable or doesn’t exist; the empty string (<code class="docutils literal notranslate"><span class="pre">''</span></code>) if the
file’s format can’t be guessed; or a string containing the required module name,
such as <code class="docutils literal notranslate"><span class="pre">'dbm'</span></code> or <code class="docutils literal notranslate"><span class="pre">'gdbm'</span></code>.</p>
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