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  <div class="section" id="interprocess-communication-and-networking">
<span id="ipc"></span><h1>17. Interprocess Communication and Networking<a class="headerlink" href="#interprocess-communication-and-networking" title="Permalink to this headline">¶</a></h1>
<p>The modules described in this chapter provide mechanisms for different processes
to communicate.</p>
<p>Some modules only work for two processes that are on the same machine, e.g.
<a title="Set handlers for asynchronous events." class="reference external" href="signal.html#module-signal"><tt class="xref docutils literal"><span class="pre">signal</span></tt></a> and <a title="Subprocess management." class="reference external" href="subprocess.html#module-subprocess"><tt class="xref docutils literal"><span class="pre">subprocess</span></tt></a>.  Other modules support networking protocols
that two or more processes can used to communicate across machines.</p>
<p>The list of modules described in this chapter is:</p>
<ul>
<li class="toctree-l1"><a class="reference external" href="subprocess.html">17.1. <tt class="docutils literal"><span class="pre">subprocess</span></tt> &#8212; Subprocess management</a><ul>
<li class="toctree-l2"><a class="reference external" href="subprocess.html#using-the-subprocess-module">17.1.1. Using the subprocess Module</a><ul>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#convenience-functions">17.1.1.1. Convenience Functions</a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#exceptions">17.1.1.2. Exceptions</a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#security">17.1.1.3. Security</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference external" href="subprocess.html#popen-objects">17.1.2. Popen Objects</a></li>
<li class="toctree-l2"><a class="reference external" href="subprocess.html#replacing-older-functions-with-the-subprocess-module">17.1.3. Replacing Older Functions with the subprocess Module</a><ul>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#replacing-bin-sh-shell-backquote">17.1.3.1. Replacing /bin/sh shell backquote</a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#replacing-shell-pipeline">17.1.3.2. Replacing shell pipeline</a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#replacing-os-system">17.1.3.3. Replacing <tt class="docutils literal"><span class="pre">os.system()</span></tt></a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#replacing-the-os-spawn-family">17.1.3.4. Replacing the <tt class="docutils literal"><span class="pre">os.spawn</span></tt> family</a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#replacing-os-popen-os-popen2-os-popen3">17.1.3.5. Replacing <tt class="docutils literal"><span class="pre">os.popen()</span></tt>, <tt class="docutils literal"><span class="pre">os.popen2()</span></tt>, <tt class="docutils literal"><span class="pre">os.popen3()</span></tt></a></li>
<li class="toctree-l3"><a class="reference external" href="subprocess.html#replacing-functions-from-the-popen2-module">17.1.3.6. Replacing functions from the <tt class="docutils literal"><span class="pre">popen2</span></tt> module</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="socket.html">17.2. <tt class="docutils literal"><span class="pre">socket</span></tt> &#8212; Low-level networking interface</a><ul>
<li class="toctree-l2"><a class="reference external" href="socket.html#socket-objects">17.2.1. Socket Objects</a></li>
<li class="toctree-l2"><a class="reference external" href="socket.html#example">17.2.2. Example</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="ssl.html">17.3. <tt class="docutils literal"><span class="pre">ssl</span></tt> &#8212; SSL wrapper for socket objects</a><ul>
<li class="toctree-l2"><a class="reference external" href="ssl.html#functions-constants-and-exceptions">17.3.1. Functions, Constants, and Exceptions</a></li>
<li class="toctree-l2"><a class="reference external" href="ssl.html#sslsocket-objects">17.3.2. SSLSocket Objects</a></li>
<li class="toctree-l2"><a class="reference external" href="ssl.html#certificates">17.3.3. Certificates</a></li>
<li class="toctree-l2"><a class="reference external" href="ssl.html#examples">17.3.4. Examples</a><ul>
<li class="toctree-l3"><a class="reference external" href="ssl.html#testing-for-ssl-support">17.3.4.1. Testing for SSL support</a></li>
<li class="toctree-l3"><a class="reference external" href="ssl.html#client-side-operation">17.3.4.2. Client-side operation</a></li>
<li class="toctree-l3"><a class="reference external" href="ssl.html#server-side-operation">17.3.4.3. Server-side operation</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="signal.html">17.4. <tt class="docutils literal"><span class="pre">signal</span></tt> &#8212; Set handlers for asynchronous events</a><ul>
<li class="toctree-l2"><a class="reference external" href="signal.html#example">17.4.1. Example</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="asyncore.html">17.5. <tt class="docutils literal"><span class="pre">asyncore</span></tt> &#8212; Asynchronous socket handler</a><ul>
<li class="toctree-l2"><a class="reference external" href="asyncore.html#asyncore-example-basic-http-client">17.5.1. asyncore Example basic HTTP client</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="asynchat.html">17.6. <tt class="docutils literal"><span class="pre">asynchat</span></tt> &#8212; Asynchronous socket command/response handler</a><ul>
<li class="toctree-l2"><a class="reference external" href="asynchat.html#asynchat-auxiliary-classes-and-functions">17.6.1. asynchat - Auxiliary Classes and Functions</a></li>
<li class="toctree-l2"><a class="reference external" href="asynchat.html#asynchat-example">17.6.2. asynchat Example</a></li>
</ul>
</li>
</ul>
</div>


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