<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <link rel="STYLESHEET" href="lib.css" type='text/css' /> <link rel="SHORTCUT ICON" href="../icons/pyfav.gif" /> <link rel='start' href='../index.html' title='Python Documentation Index' /> <link rel="first" href="lib.html" title='Python Library Reference' /> <link rel='contents' href='contents.html' title="Contents" /> <link rel='index' href='genindex.html' title='Index' /> <link rel='last' href='about.html' title='About this document...' /> <link rel='help' href='about.html' title='About this document...' /> <LINK rel="next" href="strings.html"> <LINK rel="prev" href="builtin.html"> <LINK rel="parent" href="lib.html"> <LINK rel="next" href="module-sys.html"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <meta name='aesop' content='information' /> <META name="description" content=". Python Runtime Services "> <META name="keywords" content="lib"> <META name="resource-type" content="document"> <META name="distribution" content="global"> <title>3. Python Runtime Services </title> </head> <body> <DIV CLASS="navigation"> <div id='top-navigation-panel'> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td class='online-navigation'><a rel="prev" title="2.5 Built-in Constants" href="node34.html"><img src='../icons/previous.png' border='0' height='32' alt='Previous Page' width='32' /></A></td> <td class='online-navigation'><a rel="parent" title="Python Library Reference" href="lib.html"><img src='../icons/up.png' border='0' height='32' alt='Up One Level' width='32' /></A></td> <td class='online-navigation'><a rel="next" title="3.1 sys " href="module-sys.html"><img src='../icons/next.png' border='0' height='32' alt='Next Page' width='32' /></A></td> <td align="center" width="100%">Python Library Reference</td> <td class='online-navigation'><a rel="contents" title="Table of Contents" href="contents.html"><img src='../icons/contents.png' border='0' height='32' alt='Contents' width='32' /></A></td> <td class='online-navigation'><a href="modindex.html" title="Module Index"><img src='../icons/modules.png' border='0' height='32' alt='Module Index' width='32' /></a></td> <td class='online-navigation'><a rel="index" title="Index" href="genindex.html"><img src='../icons/index.png' border='0' height='32' alt='Index' width='32' /></A></td> </tr></table> <div class='online-navigation'> <b class="navlabel">Previous:</b> <a class="sectref" rel="prev" href="node34.html">2.5 Built-in Constants</A> <b class="navlabel">Up:</b> <a class="sectref" rel="parent" href="lib.html">Python Library Reference</A> <b class="navlabel">Next:</b> <a class="sectref" rel="next" href="module-sys.html">3.1 sys </A> </div> <hr /></div> </DIV> <!--End of Navigation Panel--> <H1><A NAME="SECTION005000000000000000000"><!--x--></A><A NAME="python"><!--z--></A> <BR> 3. Python Runtime Services </H1> <P> The modules described in this chapter provide a wide range of services related to the Python interpreter and its interaction with its environment. Here's an overview: <P> <table class='synopsistable' valign='baseline'> <tr class='oddrow'> <td><b><tt class='module'><a href='module-sys.html'>sys</a></tt></b></td> <td> </td> <td class='synopsis'>Access system-specific parameters and functions.</td></tr> <tr><td><b><tt class='module'><a href='module-gc.html'>gc</a></tt></b></td> <td> </td> <td class='synopsis'>Interface to the cycle-detecting garbage collector.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-weakref.html'>weakref</a></tt></b></td> <td> </td> <td class='synopsis'>Support for weak references and weak dictionaries.</td></tr> <tr><td><b><tt class='module'><a href='module-fpectl.html'>fpectl</a></tt></b></td> <td> </td> <td class='synopsis'>Provide control for floating point exception handling.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-atexit.html'>atexit</a></tt></b></td> <td> </td> <td class='synopsis'>Register and execute cleanup functions.</td></tr> <tr><td><b><tt class='module'><a href='module-types.html'>types</a></tt></b></td> <td> </td> <td class='synopsis'>Names for built-in types.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-UserDict.html'>UserDict</a></tt></b></td> <td> </td> <td class='synopsis'>Class wrapper for dictionary objects.</td></tr> <tr><td><b><tt class='module'><a href='module-UserList.html'>UserList</a></tt></b></td> <td> </td> <td class='synopsis'>Class wrapper for list objects.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-UserString.html'>UserString</a></tt></b></td> <td> </td> <td class='synopsis'>Class wrapper for string objects.</td></tr> <tr><td><b><tt class='module'><a href='module-operator.html'>operator</a></tt></b></td> <td> </td> <td class='synopsis'>All Python's standard operators as built-in functions.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-inspect.html'>inspect</a></tt></b></td> <td> </td> <td class='synopsis'>Extract information and source code from live objects.</td></tr> <tr><td><b><tt class='module'><a href='module-traceback.html'>traceback</a></tt></b></td> <td> </td> <td class='synopsis'>Print or retrieve a stack traceback.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-linecache.html'>linecache</a></tt></b></td> <td> </td> <td class='synopsis'>This module provides random access to individual lines from text files.</td></tr> <tr><td><b><tt class='module'><a href='module-pickle.html'>pickle</a></tt></b></td> <td> </td> <td class='synopsis'>Convert Python objects to streams of bytes and back.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-cPickle.html'>cPickle</a></tt></b></td> <td> </td> <td class='synopsis'>Faster version of <tt class="module"><a href="module-pickle.html">pickle</a></tt>, but not subclassable.</td></tr> <tr><td><b><tt class='module'><a href='module-copyreg.html'>copy_reg</a></tt></b></td> <td> </td> <td class='synopsis'>Register <tt class="module">pickle</tt> support functions.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-shelve.html'>shelve</a></tt></b></td> <td> </td> <td class='synopsis'>Python object persistence.</td></tr> <tr><td><b><tt class='module'><a href='module-copy.html'>copy</a></tt></b></td> <td> </td> <td class='synopsis'>Shallow and deep copy operations.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-marshal.html'>marshal</a></tt></b></td> <td> </td> <td class='synopsis'>Convert Python objects to streams of bytes and back (with different constraints).</td></tr> <tr><td><b><tt class='module'><a href='module-warnings.html'>warnings</a></tt></b></td> <td> </td> <td class='synopsis'>Issue warning messages and control their disposition.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-imp.html'>imp</a></tt></b></td> <td> </td> <td class='synopsis'>Access the implementation of the <tt class="keyword">import</tt> statement.</td></tr> <tr><td><b><tt class='module'><a href='module-pkgutil.html'>pkgutil</a></tt></b></td> <td> </td> <td class='synopsis'>Utilities to support extension of packages.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-code.html'>code</a></tt></b></td> <td> </td> <td class='synopsis'>Base classes for interactive Python interpreters.</td></tr> <tr><td><b><tt class='module'><a href='module-codeop.html'>codeop</a></tt></b></td> <td> </td> <td class='synopsis'>Compile (possibly incomplete) Python code.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-pprint.html'>pprint</a></tt></b></td> <td> </td> <td class='synopsis'>Data pretty printer.</td></tr> <tr><td><b><tt class='module'><a href='module-repr.html'>repr</a></tt></b></td> <td> </td> <td class='synopsis'>Alternate <tt class="function">repr()</tt> implementation with size limits.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-new.html'>new</a></tt></b></td> <td> </td> <td class='synopsis'>Interface to the creation of runtime implementation objects.</td></tr> <tr><td><b><tt class='module'><a href='module-site.html'>site</a></tt></b></td> <td> </td> <td class='synopsis'>A standard way to reference site-specific modules.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-user.html'>user</a></tt></b></td> <td> </td> <td class='synopsis'>A standard way to reference user-specific modules.</td></tr> <tr><td><b><tt class='module'><a href='module-builtin.html'>__builtin__</a></tt></b></td> <td> </td> <td class='synopsis'>The set of built-in functions.</td></tr> <tr class='oddrow'> <td><b><tt class='module'><a href='module-main.html'>__main__</a></tt></b></td> <td> </td> <td class='synopsis'>The environment where the top-level script is run.</td></tr> <tr><td><b><tt class='module'><a href='module-future.html'>__future__</a></tt></b></td> <td> </td> <td class='synopsis'>Future statement definitions</td></tr> </table> <BR> <DIV CLASS="navigation"> <div class='online-navigation'><hr /> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td class='online-navigation'><a rel="prev" title="2.5 Built-in Constants" rel="prev" title="2.5 Built-in Constants" href="node34.html"><img src='../icons/previous.png' border='0' height='32' alt='Previous Page' width='32' /></A></td> <td class='online-navigation'><a rel="parent" title="Python Library Reference" rel="parent" title="Python Library Reference" href="lib.html"><img src='../icons/up.png' border='0' height='32' alt='Up One Level' width='32' /></A></td> <td class='online-navigation'><a rel="next" title="3.1 sys " rel="next" title="3.1 sys " href="module-sys.html"><img src='../icons/next.png' border='0' height='32' alt='Next Page' width='32' /></A></td> <td align="center" width="100%">Python Library Reference</td> <td class='online-navigation'><a rel="contents" title="Table of Contents" 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