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Interprocess Communication and Networking — Python 2.7.5 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: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.5 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 2.7.5 documentation" href="../index.html" /> <link rel="up" title="The Python Standard Library" href="index.html" /> <link rel="next" title="17.1. subprocess — Subprocess management" href="subprocess.html" /> <link rel="prev" title="16.9. rlcompleter — Completion function for GNU readline" href="rlcompleter.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="subprocess.html" title="17.1. subprocess — Subprocess management" accesskey="N">next</a> |</li> <li class="right" > <a href="rlcompleter.html" title="16.9. rlcompleter — Completion function for GNU readline" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" accesskey="U">The Python Standard Library</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <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 class="reference internal" href="signal.html#module-signal" title="signal: Set handlers for asynchronous events."><tt class="xref py py-mod docutils literal"><span class="pre">signal</span></tt></a> and <a class="reference internal" href="subprocess.html#module-subprocess" title="subprocess: Subprocess management."><tt class="xref py py-mod 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> <div class="toctree-wrapper compound"> <ul> <li class="toctree-l1"><a class="reference internal" href="subprocess.html">17.1. <tt class="docutils literal"><span class="pre">subprocess</span></tt> — Subprocess management</a><ul> <li class="toctree-l2"><a class="reference internal" href="subprocess.html#using-the-subprocess-module">17.1.1. Using the <tt class="docutils literal"><span class="pre">subprocess</span></tt> Module</a><ul> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#frequently-used-arguments">17.1.1.1. Frequently Used Arguments</a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#popen-constructor">17.1.1.2. Popen Constructor</a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#exceptions">17.1.1.3. Exceptions</a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#security">17.1.1.4. Security</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="subprocess.html#popen-objects">17.1.2. Popen Objects</a></li> <li class="toctree-l2"><a class="reference internal" href="subprocess.html#windows-popen-helpers">17.1.3. Windows Popen Helpers</a><ul> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#constants">17.1.3.1. Constants</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="subprocess.html#replacing-older-functions-with-the-subprocess-module">17.1.4. Replacing Older Functions with the <tt class="docutils literal"><span class="pre">subprocess</span></tt> Module</a><ul> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#replacing-bin-sh-shell-backquote">17.1.4.1. Replacing /bin/sh shell backquote</a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#replacing-shell-pipeline">17.1.4.2. Replacing shell pipeline</a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#replacing-os-system">17.1.4.3. Replacing <tt class="docutils literal"><span class="pre">os.system()</span></tt></a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#replacing-the-os-spawn-family">17.1.4.4. Replacing the <tt class="docutils literal"><span class="pre">os.spawn</span></tt> family</a></li> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#replacing-os-popen-os-popen2-os-popen3">17.1.4.5. 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 internal" href="subprocess.html#replacing-functions-from-the-popen2-module">17.1.4.6. Replacing functions from the <tt class="docutils literal"><span class="pre">popen2</span></tt> module</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="subprocess.html#notes">17.1.5. Notes</a><ul> <li class="toctree-l3"><a class="reference internal" href="subprocess.html#converting-an-argument-sequence-to-a-string-on-windows">17.1.5.1. Converting an argument sequence to a string on Windows</a></li> </ul> </li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="socket.html">17.2. <tt class="docutils literal"><span class="pre">socket</span></tt> — Low-level networking interface</a><ul> <li class="toctree-l2"><a class="reference internal" href="socket.html#socket-objects">17.2.1. Socket Objects</a></li> <li class="toctree-l2"><a class="reference internal" href="socket.html#example">17.2.2. Example</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="ssl.html">17.3. <tt class="docutils literal"><span class="pre">ssl</span></tt> — TLS/SSL wrapper for socket objects</a><ul> <li class="toctree-l2"><a class="reference internal" href="ssl.html#functions-constants-and-exceptions">17.3.1. Functions, Constants, and Exceptions</a></li> <li class="toctree-l2"><a class="reference internal" href="ssl.html#sslsocket-objects">17.3.2. SSLSocket Objects</a></li> <li class="toctree-l2"><a class="reference internal" href="ssl.html#certificates">17.3.3. Certificates</a></li> <li class="toctree-l2"><a class="reference internal" href="ssl.html#examples">17.3.4. Examples</a><ul> <li class="toctree-l3"><a class="reference internal" href="ssl.html#testing-for-ssl-support">17.3.4.1. Testing for SSL support</a></li> <li class="toctree-l3"><a class="reference internal" href="ssl.html#client-side-operation">17.3.4.2. Client-side operation</a></li> <li class="toctree-l3"><a class="reference internal" 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 internal" href="signal.html">17.4. <tt class="docutils literal"><span class="pre">signal</span></tt> — Set handlers for asynchronous events</a><ul> <li class="toctree-l2"><a class="reference internal" href="signal.html#example">17.4.1. Example</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="popen2.html">17.5. <tt class="docutils literal"><span class="pre">popen2</span></tt> — Subprocesses with accessible I/O streams</a><ul> <li class="toctree-l2"><a class="reference internal" href="popen2.html#popen3-and-popen4-objects">17.5.1. Popen3 and Popen4 Objects</a></li> <li class="toctree-l2"><a class="reference internal" href="popen2.html#flow-control-issues">17.5.2. Flow Control Issues</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="asyncore.html">17.6. <tt class="docutils literal"><span class="pre">asyncore</span></tt> — Asynchronous socket handler</a><ul> <li class="toctree-l2"><a class="reference internal" href="asyncore.html#asyncore-example-basic-http-client">17.6.1. asyncore Example basic HTTP client</a></li> <li class="toctree-l2"><a class="reference internal" href="asyncore.html#asyncore-example-basic-echo-server">17.6.2. asyncore Example basic echo server</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="asynchat.html">17.7. <tt class="docutils literal"><span class="pre">asynchat</span></tt> — Asynchronous socket command/response handler</a><ul> <li class="toctree-l2"><a class="reference internal" href="asynchat.html#asynchat-auxiliary-classes">17.7.1. asynchat - Auxiliary Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="asynchat.html#asynchat-example">17.7.2. asynchat Example</a></li> </ul> </li> </ul> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="rlcompleter.html" title="previous chapter">16.9. <tt class="docutils literal"><span class="pre">rlcompleter</span></tt> — Completion function for GNU readline</a></p> <h4>Next topic</h4> <p class="topless"><a href="subprocess.html" title="next chapter">17.1. <tt class="docutils literal"><span class="pre">subprocess</span></tt> — Subprocess management</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/ipc.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" /> <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="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="subprocess.html" title="17.1. subprocess — Subprocess management" >next</a> |</li> <li class="right" > <a href="rlcompleter.html" title="16.9. rlcompleter — Completion function for GNU readline" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" >The Python Standard Library</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2020, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="http://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Oct 13, 2020. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3. </div> </body> </html>