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<H1><A NAME="SECTION005000000000000000000"></A>
<BR>
3. Python 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>
  <tr><td><b><tt><a href="module-sys.html">sys</a></tt></b></td>
      <td>Access system-specific parameters and functions.</td></tr>
  <tr><td><b><tt><a href="module-types.html">types</a></tt></b></td>
      <td>Names for all built-in types.</td></tr>
  <tr><td><b><tt><a href="module-UserDict.html">UserDict</a></tt></b></td>
      <td>Class wrapper for dictionary objects.</td></tr>
  <tr><td><b><tt><a href="module-UserList.html">UserList</a></tt></b></td>
      <td>Class wrapper for list objects.</td></tr>
  <tr><td><b><tt><a href="module-operator.html">operator</a></tt></b></td>
      <td>All Python's standard operators as built-in functions.</td></tr>
  <tr><td><b><tt><a href="module-traceback.html">traceback</a></tt></b></td>
      <td>Print or retrieve a stack traceback.</td></tr>
  <tr><td><b><tt><a href="module-pickle.html">pickle</a></tt></b></td>
      <td>Convert Python objects to streams of bytes and back.</td></tr>
  <tr><td><b><tt><a href="module-cPickle.html">cPickle</a></tt></b></td>
      <td>Faster version of <tt class=module>pickle</tt>, but not subclassable.</td></tr>
  <tr><td><b><tt><a href="module-copyreg.html">copy_reg</a></tt></b></td>
      <td>Register <tt class=module>pickle</tt> support functions.</td></tr>
  <tr><td><b><tt><a href="module-shelve.html">shelve</a></tt></b></td>
      <td>Python object persistency.</td></tr>
  <tr><td><b><tt><a href="module-copy.html">copy</a></tt></b></td>
      <td>Shallow and deep copy operations.</td></tr>
  <tr><td><b><tt><a href="module-marshal.html">marshal</a></tt></b></td>
      <td>Convert Python objects to streams of bytes and back
                (with different constraints).</td></tr>
  <tr><td><b><tt><a href="module-imp.html">imp</a></tt></b></td>
      <td>Access the implementation of the <tt class=keyword>import</tt> statement.</td></tr>
  <tr><td><b><tt><a href="module-parser.html">parser</a></tt></b></td>
      <td>Access parse trees for Python source code.</td></tr>
  <tr><td><b><tt><a href="module-symbol.html">symbol</a></tt></b></td>
      <td>Constants representing internal nodes of the parse tree.</td></tr>
  <tr><td><b><tt><a href="module-token.html">token</a></tt></b></td>
      <td>Constants representing terminal nodes of the parse tree.</td></tr>
  <tr><td><b><tt><a href="module-keyword.html">keyword</a></tt></b></td>
      <td>Test whether a string is a keyword in Python.</td></tr>
  <tr><td><b><tt><a href="module-tokenize.html">tokenize</a></tt></b></td>
      <td>Lexical scanner for Python source code.</td></tr>
  <tr><td><b><tt><a href="module-pyclbr.html">pyclbr</a></tt></b></td>
      <td>Supports information extraction for a Python class
                browser.</td></tr>
  <tr><td><b><tt><a href="module-code.html">code</a></tt></b></td>
      <td>Code object services.</td></tr>
  <tr><td><b><tt><a href="module-pprint.html">pprint</a></tt></b></td>
      <td>Data pretty printer.</td></tr>
  <tr><td><b><tt><a href="module-repr.html">repr</a></tt></b></td>
      <td>Alternate <tt class=function>repr()</tt> implementation with size limits.</td></tr>
  <tr><td><b><tt><a href="module-pycompile.html">py_compile</a></tt></b></td>
      <td>Compile Python source files to byte-code files.</td></tr>
  <tr><td><b><tt><a href="module-compileall.html">compileall</a></tt></b></td>
      <td>Tools for byte-compiling all Python source files in a
directory tree.</td></tr>
  <tr><td><b><tt><a href="module-dis.html">dis</a></tt></b></td>
      <td>Disassembler.</td></tr>
  <tr><td><b><tt><a href="module-site.html">site</a></tt></b></td>
      <td>A standard way to reference site-specific modules.</td></tr>
  <tr><td><b><tt><a href="module-user.html">user</a></tt></b></td>
      <td>A standard way to reference user-specific modules.</td></tr>
  <tr><td><b><tt><a href="module-builtin.html">__builtin__</a></tt></b></td>
      <td>The set of built-in functions.</td></tr>
  <tr><td><b><tt><a href="module-main.html">__main__</a></tt></b></td>
      <td>The environment where the top-level script is run.</td></tr>
</table>
<BR>
<p>
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