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<FONT><h3>Generic Operational System</h3>
<p>This group of services provides interfaces to operating system features that you can use in almost every platform. Most of Python's operating system modules are based on the <tT CLAss="monofont">Posix</tt> interface.</P>
<H4><TT clasS="monofont">os</TT></H4>
<p>The <tt class="monofont">os</tt> module is a portable OS API that searches for Operating-System杁ependent built-in modules (<tt class="monofont">mac,</tt>
<tT clAss="monofont">posix,</tT>
<tt clAss="monofont">nt</tT>), and exports their functionality using the same interface. Certain tools are available only on platforms that support them. However, it is highly recommended that you use this module instead of the platform-specific modules, which are really an implementation detail of <TT Class="monofont">os.</TT> By using the <TT clasS="monofont">os</TT> module, you make your program more portable.</P>
<h5><tt cLASS="monofont">os.environ</tt></h5>
<p>This is a <i>dictionary</i> that contains all the environment variables.</p>
<p>You can <a name="idx1073742845"></a><a name="idx1073742846"></a><A naMe="idx1073742847"></a>search for a specific variable:</p>
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>>> import os
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