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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>11.7. whichdb — Guess which DBM module created a database — Python v2.6.6 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.6.6', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v2.6.6 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python v2.6.6 documentation" href="../index.html" /> <link rel="up" title="11. 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Data Persistence</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-whichdb"> <h1>11.7. <tt class="xref docutils literal"><span class="pre">whichdb</span></tt> — 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="first admonition-title">Note</p> <p class="last">The <tt class="xref docutils literal"><span class="pre">whichdb</span></tt> module’s only function has been put into the <a title="(Unix) The standard "database" interface, based on ndbm." class="reference external" href="dbm.html#module-dbm"><tt class="xref docutils literal"><span class="pre">dbm</span></tt></a> module in Python 3.0. The <a class="reference external" href="../glossary.html#term-to3"><em class="xref">2to3</em></a> tool will automatically adapt imports when converting your sources to 3.0.</p> </div> <p>The single function in this module attempts to guess which of the several simple database modules available–<a title="(Unix) The standard "database" interface, based on ndbm." class="reference external" href="dbm.html#module-dbm"><tt class="xref docutils literal"><span class="pre">dbm</span></tt></a>, <a title="(Unix) GNU's reinterpretation of dbm." class="reference external" href="gdbm.html#module-gdbm"><tt class="xref docutils literal"><span class="pre">gdbm</span></tt></a>, or <a title="DBM-style interface to the BSD database library." class="reference external" href="dbhash.html#module-dbhash"><tt class="xref docutils literal"><span class="pre">dbhash</span></tt></a>–should be used to open a given file.</p> <dl class="function"> <dt id="whichdb.whichdb"> <tt class="descclassname">whichdb.</tt><tt class="descname">whichdb</tt><big>(</big><em>filename</em><big>)</big><a class="headerlink" href="#whichdb.whichdb" title="Permalink to this definition">¶</a></dt> <dd>Returns one of the following values: <tt class="xref docutils literal"><span class="pre">None</span></tt> if the file can’t be opened because it’s unreadable or doesn’t exist; the empty string (<tt class="docutils literal"><span class="pre">''</span></tt>) if the file’s format can’t be guessed; or a string containing the required module name, such as <tt class="docutils literal"><span class="pre">'dbm'</span></tt> or <tt class="docutils literal"><span class="pre">'gdbm'</span></tt>.</dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="anydbm.html" title="previous chapter">11.6. <tt class="docutils literal docutils literal docutils literal"><span class="pre">anydbm</span></tt> — Generic access to DBM-style databases</a></p> <h4>Next topic</h4> <p class="topless"><a href="dbm.html" title="next chapter">11.8. <tt class="docutils literal docutils literal docutils literal"><span class="pre">dbm</span></tt> — Simple “database” interface</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/whichdb.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../modindex.html" title="Global Module Index" >modules</a> |</li> <li class="right" > <a href="dbm.html" title="11.8. dbm — Simple “database” interface" >next</a> |</li> <li class="right" > <a href="anydbm.html" title="11.6. anydbm — Generic access to DBM-style databases" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="persistence.html" >11. 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