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<title>18.5 tokenize -- Tokenizer for Python source</title>
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<H1><A NAME="SECTION0020500000000000000000">
18.5 <tt class="module">tokenize</tt> --
         Tokenizer for Python source</A>
</H1>

<P>
<A NAME="module-tokenize"></A>

<P>
The <tt class="module">tokenize</tt> module provides a lexical scanner for Python
source code, implemented in Python.  The scanner in this module
returns comments as tokens as well, making it useful for implementing
``pretty-printers,'' including colorizers for on-screen displays.

<P>
The primary entry point is a generator:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4969' xml:id='l2h-4969' class="function">generate_tokens</tt></b>(</nobr></td>
  <td><var>readline</var>)</td></tr></table></dt>
<dd>
  The <tt class="function">generate_tokens()</tt> generator requires one argment,
  <var>readline</var>, which must be a callable object which
  provides the same interface as the <tt class="method">readline()</tt> method of
  built-in file objects (see section&nbsp;<A href="bltin-file-objects.html#bltin-file-objects">2.3.9</A>).  Each
  call to the function should return one line of input as a string.

<P>
The generator produces 5-tuples with these members:
  the token type;
  the token string;
  a 2-tuple <code>(<var>srow</var>, <var>scol</var>)</code> of ints specifying the
  row and column where the token begins in the source;
  a 2-tuple <code>(<var>erow</var>, <var>ecol</var>)</code> of ints specifying the
  row and column where the token ends in the source;
  and the line on which the token was found.
  The line passed is the <em>logical</em> line;
  continuation lines are included.

<span class="versionnote">New in version 2.2.</span>

</dl>

<P>
An older entry point is retained for backward compatibility:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4970' xml:id='l2h-4970' class="function">tokenize</tt></b>(</nobr></td>
  <td><var>readline</var><big>[</big><var>, tokeneater</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  The <tt class="function">tokenize()</tt> function accepts two parameters: one
  representing the input stream, and one providing an output mechanism
  for <tt class="function">tokenize()</tt>.

<P>
The first parameter, <var>readline</var>, must be a callable object which
  provides the same interface as the <tt class="method">readline()</tt> method of
  built-in file objects (see section&nbsp;<A href="bltin-file-objects.html#bltin-file-objects">2.3.9</A>).  Each
  call to the function should return one line of input as a string.

<P>
The second parameter, <var>tokeneater</var>, must also be a callable
  object.  It is called once for each token, with five arguments,
  corresponding to the tuples generated by <tt class="function">generate_tokens()</tt>.
</dl>

<P>
All constants from the <tt class="module"><a href="module-token.html">token</a></tt> module are also exported from
<tt class="module">tokenize</tt>, as are two additional token type values that might be
passed to the <var>tokeneater</var> function by <tt class="function">tokenize()</tt>:

<P>
<dl><dt><b><tt id='l2h-4971' xml:id='l2h-4971'>COMMENT</tt></b></dt>
<dd>
  Token value used to indicate a comment.
</dd></dl>
<dl><dt><b><tt id='l2h-4972' xml:id='l2h-4972'>NL</tt></b></dt>
<dd>
  Token value used to indicate a non-terminating newline.  The NEWLINE
  token indicates the end of a logical line of Python code; NL tokens
  are generated when a logical line of code is continued over multiple
  physical lines.
</dd></dl>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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