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  <div class="section" id="to3-automated-python-2-to-3-code-translation">
<span id="to3-reference"></span><h1>26.7. 2to3 - Automated Python 2 to 3 code translation<a class="headerlink" href="#to3-automated-python-2-to-3-code-translation" title="Permalink to this headline">¶</a></h1>
<p>2to3 is a Python program that reads Python 2.x source code and applies a series
of <em>fixers</em> to transform it into valid Python 3.x code.  The standard library
contains a rich set of fixers that will handle almost all code.  2to3 supporting
library <a class="reference internal" href="#module-lib2to3" title="lib2to3: the 2to3 library"><code class="xref py py-mod docutils literal notranslate"><span class="pre">lib2to3</span></code></a> is, however, a flexible and generic library, so it is
possible to write your own fixers for 2to3.  <a class="reference internal" href="#module-lib2to3" title="lib2to3: the 2to3 library"><code class="xref py py-mod docutils literal notranslate"><span class="pre">lib2to3</span></code></a> could also be
adapted to custom applications in which Python code needs to be edited
automatically.</p>
<div class="section" id="using-2to3">
<span id="to3-using"></span><h2>26.7.1. Using 2to3<a class="headerlink" href="#using-2to3" title="Permalink to this headline">¶</a></h2>
<p>2to3 will usually be installed with the Python interpreter as a script.  It is
also located in the <code class="file docutils literal notranslate"><span class="pre">Tools/scripts</span></code> directory of the Python root.</p>
<p>2to3’s basic arguments are a list of files or directories to transform.  The
directories are recursively traversed for Python sources.</p>
<p>Here is a sample Python 2.x source file, <code class="file docutils literal notranslate"><span class="pre">example.py</span></code>:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">greet</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
    <span class="nb">print</span> <span class="s2">&quot;Hello, </span><span class="si">{0}</span><span class="s2">!&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span> <span class="s2">&quot;What&#39;s your name?&quot;</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">raw_input</span><span class="p">()</span>
<span class="n">greet</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
</pre></div>
</div>
<p>It can be converted to Python 3.x code via 2to3 on the command line:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 example.py
</pre></div>
</div>
<p>A diff against the original source file is printed.  2to3 can also write the
needed modifications right back to the source file.  (A backup of the original
file is made unless <code class="xref std std-option docutils literal notranslate"><span class="pre">-n</span></code> is also given.)  Writing the changes back is
enabled with the <code class="xref std std-option docutils literal notranslate"><span class="pre">-w</span></code> flag:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 -w example.py
</pre></div>
</div>
<p>After transformation, <code class="file docutils literal notranslate"><span class="pre">example.py</span></code> looks like this:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">greet</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
    <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Hello, </span><span class="si">{0}</span><span class="s2">!&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;What&#39;s your name?&quot;</span><span class="p">)</span>
<span class="n">name</span> <span class="o">=</span> <span class="nb">input</span><span class="p">()</span>
<span class="n">greet</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
</pre></div>
</div>
<p>Comments and exact indentation are preserved throughout the translation process.</p>
<p>By default, 2to3 runs a set of <a class="reference internal" href="#to3-fixers"><span class="std std-ref">predefined fixers</span></a>.  The
<code class="xref std std-option docutils literal notranslate"><span class="pre">-l</span></code> flag lists all available fixers.  An explicit set of fixers to run
can be given with <code class="xref std std-option docutils literal notranslate"><span class="pre">-f</span></code>.  Likewise the <code class="xref std std-option docutils literal notranslate"><span class="pre">-x</span></code> explicitly disables a
fixer.  The following example runs only the <code class="docutils literal notranslate"><span class="pre">imports</span></code> and <code class="docutils literal notranslate"><span class="pre">has_key</span></code> fixers:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 -f imports -f has_key example.py
</pre></div>
</div>
<p>This command runs every fixer except the <code class="docutils literal notranslate"><span class="pre">apply</span></code> fixer:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 -x apply example.py
</pre></div>
</div>
<p>Some fixers are <em>explicit</em>, meaning they aren’t run by default and must be
listed on the command line to be run.  Here, in addition to the default fixers,
the <code class="docutils literal notranslate"><span class="pre">idioms</span></code> fixer is run:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 -f all -f idioms example.py
</pre></div>
</div>
<p>Notice how passing <code class="docutils literal notranslate"><span class="pre">all</span></code> enables all default fixers.</p>
<p>Sometimes 2to3 will find a place in your source code that needs to be changed,
but 2to3 cannot fix automatically.  In this case, 2to3 will print a warning
beneath the diff for a file.  You should address the warning in order to have
compliant 3.x code.</p>
<p>2to3 can also refactor doctests.  To enable this mode, use the <code class="xref std std-option docutils literal notranslate"><span class="pre">-d</span></code>
flag.  Note that <em>only</em> doctests will be refactored.  This also doesn’t require
the module to be valid Python.  For example, doctest like examples in a reST
document could also be refactored with this option.</p>
<p>The <code class="xref std std-option docutils literal notranslate"><span class="pre">-v</span></code> option enables output of more information on the translation
process.</p>
<p>Since some print statements can be parsed as function calls or statements, 2to3
cannot always read files containing the print function.  When 2to3 detects the
presence of the <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">__future__</span> <span class="pre">import</span> <span class="pre">print_function</span></code> compiler directive, it
modifies its internal grammar to interpret <a class="reference internal" href="functions.html#print" title="print"><code class="xref py py-func docutils literal notranslate"><span class="pre">print()</span></code></a> as a function.  This
change can also be enabled manually with the <code class="xref std std-option docutils literal notranslate"><span class="pre">-p</span></code> flag.  Use
<code class="xref std std-option docutils literal notranslate"><span class="pre">-p</span></code> to run fixers on code that already has had its print statements
converted.</p>
<p>The <code class="xref std std-option docutils literal notranslate"><span class="pre">-o</span></code> or <code class="xref std std-option docutils literal notranslate"><span class="pre">--output-dir</span></code> option allows specification of an
alternate directory for processed output files to be written to.  The
<code class="xref std std-option docutils literal notranslate"><span class="pre">-n</span></code> flag is required when using this as backup files do not make sense
when not overwriting the input files.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 3.2.3: </span>The <code class="xref std std-option docutils literal notranslate"><span class="pre">-o</span></code> option was added.</p>
</div>
<p>The <code class="xref std std-option docutils literal notranslate"><span class="pre">-W</span></code> or <code class="xref std std-option docutils literal notranslate"><span class="pre">--write-unchanged-files</span></code> flag tells 2to3 to always
write output files even if no changes were required to the file.  This is most
useful with <code class="xref std std-option docutils literal notranslate"><span class="pre">-o</span></code> so that an entire Python source tree is copied with
translation from one directory to another.
This option implies the <code class="xref std std-option docutils literal notranslate"><span class="pre">-w</span></code> flag as it would not make sense otherwise.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 3.2.3: </span>The <code class="xref std std-option docutils literal notranslate"><span class="pre">-W</span></code> flag was added.</p>
</div>
<p>The <code class="xref std std-option docutils literal notranslate"><span class="pre">--add-suffix</span></code> option specifies a string to append to all output
filenames.  The <code class="xref std std-option docutils literal notranslate"><span class="pre">-n</span></code> flag is required when specifying this as backups
are not necessary when writing to different filenames.  Example:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 -n -W --add-suffix<span class="o">=</span><span class="m">3</span> example.py
</pre></div>
</div>
<p>Will cause a converted file named <code class="docutils literal notranslate"><span class="pre">example.py3</span></code> to be written.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 3.2.3: </span>The <code class="xref std std-option docutils literal notranslate"><span class="pre">--add-suffix</span></code> option was added.</p>
</div>
<p>To translate an entire project from one directory tree to another use:</p>
<div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$</span> 2to3 --output-dir<span class="o">=</span>python3-version/mycode -W -n python2-version/mycode
</pre></div>
</div>
</div>
<div class="section" id="fixers">
<span id="to3-fixers"></span><h2>26.7.2. Fixers<a class="headerlink" href="#fixers" title="Permalink to this headline">¶</a></h2>
<p>Each step of transforming code is encapsulated in a fixer.  The command <code class="docutils literal notranslate"><span class="pre">2to3</span>
<span class="pre">-l</span></code> lists them.  As <a class="reference internal" href="#to3-using"><span class="std std-ref">documented above</span></a>, each can be turned on
and off individually.  They are described here in more detail.</p>
<dl class="2to3fixer">
<dt id="2to3fixer-apply">
<code class="descname">apply</code><a class="headerlink" href="#2to3fixer-apply" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes usage of <code class="xref py py-func docutils literal notranslate"><span class="pre">apply()</span></code>.  For example <code class="docutils literal notranslate"><span class="pre">apply(function,</span> <span class="pre">*args,</span>
<span class="pre">**kwargs)</span></code> is converted to <code class="docutils literal notranslate"><span class="pre">function(*args,</span> <span class="pre">**kwargs)</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-asserts">
<code class="descname">asserts</code><a class="headerlink" href="#2to3fixer-asserts" title="Permalink to this definition">¶</a></dt>
<dd><p>Replaces deprecated <a class="reference internal" href="unittest.html#module-unittest" title="unittest: Unit testing framework for Python."><code class="xref py py-mod docutils literal notranslate"><span class="pre">unittest</span></code></a> method names with the correct ones.</p>
<table border="1" class="docutils">
<colgroup>
<col width="43%" />
<col width="57%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">From</th>
<th class="head">To</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">failUnlessEqual(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertEqual" title="unittest.TestCase.assertEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">assertEquals(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertEqual" title="unittest.TestCase.assertEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">failIfEqual(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertNotEqual" title="unittest.TestCase.assertNotEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertNotEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">assertNotEquals(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertNotEqual" title="unittest.TestCase.assertNotEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertNotEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">failUnless(a)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertTrue" title="unittest.TestCase.assertTrue"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertTrue(a)</span></code></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">assert_(a)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertTrue" title="unittest.TestCase.assertTrue"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertTrue(a)</span></code></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">failIf(a)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertFalse" title="unittest.TestCase.assertFalse"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertFalse(a)</span></code></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">failUnlessRaises(exc,</span> <span class="pre">cal)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertRaises" title="unittest.TestCase.assertRaises"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertRaises(exc,</span> <span class="pre">cal)</span></code></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">failUnlessAlmostEqual(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertAlmostEqual" title="unittest.TestCase.assertAlmostEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertAlmostEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">assertAlmostEquals(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertAlmostEqual" title="unittest.TestCase.assertAlmostEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertAlmostEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">failIfAlmostEqual(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertNotAlmostEqual" title="unittest.TestCase.assertNotAlmostEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertNotAlmostEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">assertNotAlmostEquals(a,</span> <span class="pre">b)</span></code></td>
<td><a class="reference internal" href="unittest.html#unittest.TestCase.assertNotAlmostEqual" title="unittest.TestCase.assertNotAlmostEqual"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assertNotAlmostEqual(a,</span> <span class="pre">b)</span></code></a></td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-basestring">
<code class="descname">basestring</code><a class="headerlink" href="#2to3fixer-basestring" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="xref py py-class docutils literal notranslate"><span class="pre">basestring</span></code> to <a class="reference internal" href="stdtypes.html#str" title="str"><code class="xref py py-class docutils literal notranslate"><span class="pre">str</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-buffer">
<code class="descname">buffer</code><a class="headerlink" href="#2to3fixer-buffer" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="xref py py-class docutils literal notranslate"><span class="pre">buffer</span></code> to <a class="reference internal" href="stdtypes.html#memoryview" title="memoryview"><code class="xref py py-class docutils literal notranslate"><span class="pre">memoryview</span></code></a>.  This fixer is optional
because the <a class="reference internal" href="stdtypes.html#memoryview" title="memoryview"><code class="xref py py-class docutils literal notranslate"><span class="pre">memoryview</span></code></a> API is similar but not exactly the same as
that of <code class="xref py py-class docutils literal notranslate"><span class="pre">buffer</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-dict">
<code class="descname">dict</code><a class="headerlink" href="#2to3fixer-dict" title="Permalink to this definition">¶</a></dt>
<dd><p>Fixes dictionary iteration methods.  <code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.iteritems()</span></code> is converted to
<a class="reference internal" href="stdtypes.html#dict.items" title="dict.items"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.items()</span></code></a>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.iterkeys()</span></code> to <a class="reference internal" href="stdtypes.html#dict.keys" title="dict.keys"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.keys()</span></code></a>, and
<code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.itervalues()</span></code> to <a class="reference internal" href="stdtypes.html#dict.values" title="dict.values"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.values()</span></code></a>.  Similarly,
<code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.viewitems()</span></code>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.viewkeys()</span></code> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.viewvalues()</span></code> are
converted respectively to <a class="reference internal" href="stdtypes.html#dict.items" title="dict.items"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.items()</span></code></a>, <a class="reference internal" href="stdtypes.html#dict.keys" title="dict.keys"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.keys()</span></code></a> and
<a class="reference internal" href="stdtypes.html#dict.values" title="dict.values"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.values()</span></code></a>.  It also wraps existing usages of <a class="reference internal" href="stdtypes.html#dict.items" title="dict.items"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.items()</span></code></a>,
<a class="reference internal" href="stdtypes.html#dict.keys" title="dict.keys"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.keys()</span></code></a>, and <a class="reference internal" href="stdtypes.html#dict.values" title="dict.values"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dict.values()</span></code></a> in a call to <a class="reference internal" href="stdtypes.html#list" title="list"><code class="xref py py-class docutils literal notranslate"><span class="pre">list</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-except">
<code class="descname">except</code><a class="headerlink" href="#2to3fixer-except" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="docutils literal notranslate"><span class="pre">except</span> <span class="pre">X,</span> <span class="pre">T</span></code> to <code class="docutils literal notranslate"><span class="pre">except</span> <span class="pre">X</span> <span class="pre">as</span> <span class="pre">T</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-exec">
<code class="descname">exec</code><a class="headerlink" href="#2to3fixer-exec" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts the <code class="docutils literal notranslate"><span class="pre">exec</span></code> statement to the <a class="reference internal" href="functions.html#exec" title="exec"><code class="xref py py-func docutils literal notranslate"><span class="pre">exec()</span></code></a> function.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-execfile">
<code class="descname">execfile</code><a class="headerlink" href="#2to3fixer-execfile" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes usage of <code class="xref py py-func docutils literal notranslate"><span class="pre">execfile()</span></code>.  The argument to <code class="xref py py-func docutils literal notranslate"><span class="pre">execfile()</span></code> is
wrapped in calls to <a class="reference internal" href="functions.html#open" title="open"><code class="xref py py-func docutils literal notranslate"><span class="pre">open()</span></code></a>, <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a>, and <a class="reference internal" href="functions.html#exec" title="exec"><code class="xref py py-func docutils literal notranslate"><span class="pre">exec()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-exitfunc">
<code class="descname">exitfunc</code><a class="headerlink" href="#2to3fixer-exitfunc" title="Permalink to this definition">¶</a></dt>
<dd><p>Changes assignment of <code class="xref py py-attr docutils literal notranslate"><span class="pre">sys.exitfunc</span></code> to use of the <a class="reference internal" href="atexit.html#module-atexit" title="atexit: Register and execute cleanup functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">atexit</span></code></a>
module.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-filter">
<code class="descname">filter</code><a class="headerlink" href="#2to3fixer-filter" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps <a class="reference internal" href="functions.html#filter" title="filter"><code class="xref py py-func docutils literal notranslate"><span class="pre">filter()</span></code></a> usage in a <a class="reference internal" href="stdtypes.html#list" title="list"><code class="xref py py-class docutils literal notranslate"><span class="pre">list</span></code></a> call.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-funcattrs">
<code class="descname">funcattrs</code><a class="headerlink" href="#2to3fixer-funcattrs" title="Permalink to this definition">¶</a></dt>
<dd><p>Fixes function attributes that have been renamed.  For example,
<code class="docutils literal notranslate"><span class="pre">my_function.func_closure</span></code> is converted to <code class="docutils literal notranslate"><span class="pre">my_function.__closure__</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-future">
<code class="descname">future</code><a class="headerlink" href="#2to3fixer-future" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">__future__</span> <span class="pre">import</span> <span class="pre">new_feature</span></code> statements.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-getcwdu">
<code class="descname">getcwdu</code><a class="headerlink" href="#2to3fixer-getcwdu" title="Permalink to this definition">¶</a></dt>
<dd><p>Renames <code class="xref py py-func docutils literal notranslate"><span class="pre">os.getcwdu()</span></code> to <a class="reference internal" href="os.html#os.getcwd" title="os.getcwd"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.getcwd()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-has_key">
<code class="descname">has_key</code><a class="headerlink" href="#2to3fixer-has_key" title="Permalink to this definition">¶</a></dt>
<dd><p>Changes <code class="docutils literal notranslate"><span class="pre">dict.has_key(key)</span></code> to <code class="docutils literal notranslate"><span class="pre">key</span> <span class="pre">in</span> <span class="pre">dict</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-idioms">
<code class="descname">idioms</code><a class="headerlink" href="#2to3fixer-idioms" title="Permalink to this definition">¶</a></dt>
<dd><p>This optional fixer performs several transformations that make Python code
more idiomatic.  Type comparisons like <code class="docutils literal notranslate"><span class="pre">type(x)</span> <span class="pre">is</span> <span class="pre">SomeClass</span></code> and
<code class="docutils literal notranslate"><span class="pre">type(x)</span> <span class="pre">==</span> <span class="pre">SomeClass</span></code> are converted to <code class="docutils literal notranslate"><span class="pre">isinstance(x,</span> <span class="pre">SomeClass)</span></code>.
<code class="docutils literal notranslate"><span class="pre">while</span> <span class="pre">1</span></code> becomes <code class="docutils literal notranslate"><span class="pre">while</span> <span class="pre">True</span></code>.  This fixer also tries to make use of
<a class="reference internal" href="functions.html#sorted" title="sorted"><code class="xref py py-func docutils literal notranslate"><span class="pre">sorted()</span></code></a> in appropriate places.  For example, this block</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">L</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">some_iterable</span><span class="p">)</span>
<span class="n">L</span><span class="o">.</span><span class="n">sort</span><span class="p">()</span>
</pre></div>
</div>
<p>is changed to</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">L</span> <span class="o">=</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">some_iterable</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-import">
<code class="descname">import</code><a class="headerlink" href="#2to3fixer-import" title="Permalink to this definition">¶</a></dt>
<dd><p>Detects sibling imports and converts them to relative imports.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-imports">
<code class="descname">imports</code><a class="headerlink" href="#2to3fixer-imports" title="Permalink to this definition">¶</a></dt>
<dd><p>Handles module renames in the standard library.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-imports2">
<code class="descname">imports2</code><a class="headerlink" href="#2to3fixer-imports2" title="Permalink to this definition">¶</a></dt>
<dd><p>Handles other modules renames in the standard library.  It is separate from
the <a class="reference internal" href="#2to3fixer-imports"><code class="xref std std-2to3fixer docutils literal notranslate"><span class="pre">imports</span></code></a> fixer only because of technical limitations.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-input">
<code class="descname">input</code><a class="headerlink" href="#2to3fixer-input" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="docutils literal notranslate"><span class="pre">input(prompt)</span></code> to <code class="docutils literal notranslate"><span class="pre">eval(input(prompt))</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-intern">
<code class="descname">intern</code><a class="headerlink" href="#2to3fixer-intern" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="xref py py-func docutils literal notranslate"><span class="pre">intern()</span></code> to <a class="reference internal" href="sys.html#sys.intern" title="sys.intern"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.intern()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-isinstance">
<code class="descname">isinstance</code><a class="headerlink" href="#2to3fixer-isinstance" title="Permalink to this definition">¶</a></dt>
<dd><p>Fixes duplicate types in the second argument of <a class="reference internal" href="functions.html#isinstance" title="isinstance"><code class="xref py py-func docutils literal notranslate"><span class="pre">isinstance()</span></code></a>.  For
example, <code class="docutils literal notranslate"><span class="pre">isinstance(x,</span> <span class="pre">(int,</span> <span class="pre">int))</span></code> is converted to <code class="docutils literal notranslate"><span class="pre">isinstance(x,</span>
<span class="pre">int)</span></code> and <code class="docutils literal notranslate"><span class="pre">isinstance(x,</span> <span class="pre">(int,</span> <span class="pre">float,</span> <span class="pre">int))</span></code> is converted to
<code class="docutils literal notranslate"><span class="pre">isinstance(x,</span> <span class="pre">(int,</span> <span class="pre">float))</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-itertools_imports">
<code class="descname">itertools_imports</code><a class="headerlink" href="#2to3fixer-itertools_imports" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes imports of <code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.ifilter()</span></code>, <code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.izip()</span></code>, and
<code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.imap()</span></code>.  Imports of <code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.ifilterfalse()</span></code> are also
changed to <a class="reference internal" href="itertools.html#itertools.filterfalse" title="itertools.filterfalse"><code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.filterfalse()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-itertools">
<code class="descname">itertools</code><a class="headerlink" href="#2to3fixer-itertools" title="Permalink to this definition">¶</a></dt>
<dd><p>Changes usage of <code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.ifilter()</span></code>, <code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.izip()</span></code>, and
<code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.imap()</span></code> to their built-in equivalents.
<code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.ifilterfalse()</span></code> is changed to <a class="reference internal" href="itertools.html#itertools.filterfalse" title="itertools.filterfalse"><code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.filterfalse()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-long">
<code class="descname">long</code><a class="headerlink" href="#2to3fixer-long" title="Permalink to this definition">¶</a></dt>
<dd><p>Renames <code class="xref py py-class docutils literal notranslate"><span class="pre">long</span></code> to <a class="reference internal" href="functions.html#int" title="int"><code class="xref py py-class docutils literal notranslate"><span class="pre">int</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-map">
<code class="descname">map</code><a class="headerlink" href="#2to3fixer-map" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps <a class="reference internal" href="functions.html#map" title="map"><code class="xref py py-func docutils literal notranslate"><span class="pre">map()</span></code></a> in a <a class="reference internal" href="stdtypes.html#list" title="list"><code class="xref py py-class docutils literal notranslate"><span class="pre">list</span></code></a> call.  It also changes <code class="docutils literal notranslate"><span class="pre">map(None,</span> <span class="pre">x)</span></code>
to <code class="docutils literal notranslate"><span class="pre">list(x)</span></code>.  Using <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">future_builtins</span> <span class="pre">import</span> <span class="pre">map</span></code> disables this
fixer.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-metaclass">
<code class="descname">metaclass</code><a class="headerlink" href="#2to3fixer-metaclass" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts the old metaclass syntax (<code class="docutils literal notranslate"><span class="pre">__metaclass__</span> <span class="pre">=</span> <span class="pre">Meta</span></code> in the class
body) to the new (<code class="docutils literal notranslate"><span class="pre">class</span> <span class="pre">X(metaclass=Meta)</span></code>).</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-methodattrs">
<code class="descname">methodattrs</code><a class="headerlink" href="#2to3fixer-methodattrs" title="Permalink to this definition">¶</a></dt>
<dd><p>Fixes old method attribute names.  For example, <code class="docutils literal notranslate"><span class="pre">meth.im_func</span></code> is converted
to <code class="docutils literal notranslate"><span class="pre">meth.__func__</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-ne">
<code class="descname">ne</code><a class="headerlink" href="#2to3fixer-ne" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts the old not-equal syntax, <code class="docutils literal notranslate"><span class="pre">&lt;&gt;</span></code>, to <code class="docutils literal notranslate"><span class="pre">!=</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-next">
<code class="descname">next</code><a class="headerlink" href="#2to3fixer-next" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts the use of iterator’s <code class="xref py py-meth docutils literal notranslate"><span class="pre">next()</span></code> methods to the
<a class="reference internal" href="functions.html#next" title="next"><code class="xref py py-func docutils literal notranslate"><span class="pre">next()</span></code></a> function.  It also renames <a class="reference internal" href="functions.html#next" title="next"><code class="xref py py-meth docutils literal notranslate"><span class="pre">next()</span></code></a> methods to
<a class="reference internal" href="stdtypes.html#iterator.__next__" title="iterator.__next__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__next__()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-nonzero">
<code class="descname">nonzero</code><a class="headerlink" href="#2to3fixer-nonzero" title="Permalink to this definition">¶</a></dt>
<dd><p>Renames <code class="xref py py-meth docutils literal notranslate"><span class="pre">__nonzero__()</span></code> to <a class="reference internal" href="../reference/datamodel.html#object.__bool__" title="object.__bool__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__bool__()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-numliterals">
<code class="descname">numliterals</code><a class="headerlink" href="#2to3fixer-numliterals" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts octal literals into the new syntax.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-operator">
<code class="descname">operator</code><a class="headerlink" href="#2to3fixer-operator" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts calls to various functions in the <a class="reference internal" href="operator.html#module-operator" title="operator: Functions corresponding to the standard operators."><code class="xref py py-mod docutils literal notranslate"><span class="pre">operator</span></code></a> module to other,
but equivalent, function calls.  When needed, the appropriate <code class="docutils literal notranslate"><span class="pre">import</span></code>
statements are added, e.g. <code class="docutils literal notranslate"><span class="pre">import</span> <span class="pre">collections</span></code>.  The following mapping
are made:</p>
<table border="1" class="docutils">
<colgroup>
<col width="45%" />
<col width="55%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">From</th>
<th class="head">To</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">operator.isCallable(obj)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">hasattr(obj,</span> <span class="pre">'__call__')</span></code></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">operator.sequenceIncludes(obj)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">operator.contains(obj)</span></code></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">operator.isSequenceType(obj)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">isinstance(obj,</span> <span class="pre">collections.Sequence)</span></code></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">operator.isMappingType(obj)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">isinstance(obj,</span> <span class="pre">collections.Mapping)</span></code></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">operator.isNumberType(obj)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">isinstance(obj,</span> <span class="pre">numbers.Number)</span></code></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">operator.repeat(obj,</span> <span class="pre">n)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">operator.mul(obj,</span> <span class="pre">n)</span></code></td>
</tr>
<tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">operator.irepeat(obj,</span> <span class="pre">n)</span></code></td>
<td><code class="docutils literal notranslate"><span class="pre">operator.imul(obj,</span> <span class="pre">n)</span></code></td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-paren">
<code class="descname">paren</code><a class="headerlink" href="#2to3fixer-paren" title="Permalink to this definition">¶</a></dt>
<dd><p>Add extra parenthesis where they are required in list comprehensions.  For
example, <code class="docutils literal notranslate"><span class="pre">[x</span> <span class="pre">for</span> <span class="pre">x</span> <span class="pre">in</span> <span class="pre">1,</span> <span class="pre">2]</span></code> becomes <code class="docutils literal notranslate"><span class="pre">[x</span> <span class="pre">for</span> <span class="pre">x</span> <span class="pre">in</span> <span class="pre">(1,</span> <span class="pre">2)]</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-print">
<code class="descname">print</code><a class="headerlink" href="#2to3fixer-print" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts the <code class="docutils literal notranslate"><span class="pre">print</span></code> statement to the <a class="reference internal" href="functions.html#print" title="print"><code class="xref py py-func docutils literal notranslate"><span class="pre">print()</span></code></a> function.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-raise">
<code class="descname">raise</code><a class="headerlink" href="#2to3fixer-raise" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="docutils literal notranslate"><span class="pre">raise</span> <span class="pre">E,</span> <span class="pre">V</span></code> to <code class="docutils literal notranslate"><span class="pre">raise</span> <span class="pre">E(V)</span></code>, and <code class="docutils literal notranslate"><span class="pre">raise</span> <span class="pre">E,</span> <span class="pre">V,</span> <span class="pre">T</span></code> to <code class="docutils literal notranslate"><span class="pre">raise</span>
<span class="pre">E(V).with_traceback(T)</span></code>.  If <code class="docutils literal notranslate"><span class="pre">E</span></code> is a tuple, the translation will be
incorrect because substituting tuples for exceptions has been removed in 3.0.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-raw_input">
<code class="descname">raw_input</code><a class="headerlink" href="#2to3fixer-raw_input" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="xref py py-func docutils literal notranslate"><span class="pre">raw_input()</span></code> to <a class="reference internal" href="functions.html#input" title="input"><code class="xref py py-func docutils literal notranslate"><span class="pre">input()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-reduce">
<code class="descname">reduce</code><a class="headerlink" href="#2to3fixer-reduce" title="Permalink to this definition">¶</a></dt>
<dd><p>Handles the move of <code class="xref py py-func docutils literal notranslate"><span class="pre">reduce()</span></code> to <a class="reference internal" href="functools.html#functools.reduce" title="functools.reduce"><code class="xref py py-func docutils literal notranslate"><span class="pre">functools.reduce()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-reload">
<code class="descname">reload</code><a class="headerlink" href="#2to3fixer-reload" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts <code class="xref py py-func docutils literal notranslate"><span class="pre">reload()</span></code> to <a class="reference internal" href="imp.html#imp.reload" title="imp.reload"><code class="xref py py-func docutils literal notranslate"><span class="pre">imp.reload()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-renames">
<code class="descname">renames</code><a class="headerlink" href="#2to3fixer-renames" title="Permalink to this definition">¶</a></dt>
<dd><p>Changes <code class="xref py py-data docutils literal notranslate"><span class="pre">sys.maxint</span></code> to <a class="reference internal" href="sys.html#sys.maxsize" title="sys.maxsize"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.maxsize</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-repr">
<code class="descname">repr</code><a class="headerlink" href="#2to3fixer-repr" title="Permalink to this definition">¶</a></dt>
<dd><p>Replaces backtick repr with the <a class="reference internal" href="functions.html#repr" title="repr"><code class="xref py py-func docutils literal notranslate"><span class="pre">repr()</span></code></a> function.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-set_literal">
<code class="descname">set_literal</code><a class="headerlink" href="#2to3fixer-set_literal" title="Permalink to this definition">¶</a></dt>
<dd><p>Replaces use of the <a class="reference internal" href="stdtypes.html#set" title="set"><code class="xref py py-class docutils literal notranslate"><span class="pre">set</span></code></a> constructor with set literals.  This fixer
is optional.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-standarderror">
<code class="descname">standarderror</code><a class="headerlink" href="#2to3fixer-standarderror" title="Permalink to this definition">¶</a></dt>
<dd><p>Renames <code class="xref py py-exc docutils literal notranslate"><span class="pre">StandardError</span></code> to <a class="reference internal" href="exceptions.html#Exception" title="Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-sys_exc">
<code class="descname">sys_exc</code><a class="headerlink" href="#2to3fixer-sys_exc" title="Permalink to this definition">¶</a></dt>
<dd><p>Changes the deprecated <code class="xref py py-data docutils literal notranslate"><span class="pre">sys.exc_value</span></code>, <code class="xref py py-data docutils literal notranslate"><span class="pre">sys.exc_type</span></code>,
<code class="xref py py-data docutils literal notranslate"><span class="pre">sys.exc_traceback</span></code> to use <a class="reference internal" href="sys.html#sys.exc_info" title="sys.exc_info"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exc_info()</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-throw">
<code class="descname">throw</code><a class="headerlink" href="#2to3fixer-throw" title="Permalink to this definition">¶</a></dt>
<dd><p>Fixes the API change in generator’s <code class="xref py py-meth docutils literal notranslate"><span class="pre">throw()</span></code> method.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-tuple_params">
<code class="descname">tuple_params</code><a class="headerlink" href="#2to3fixer-tuple_params" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes implicit tuple parameter unpacking.  This fixer inserts temporary
variables.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-types">
<code class="descname">types</code><a class="headerlink" href="#2to3fixer-types" title="Permalink to this definition">¶</a></dt>
<dd><p>Fixes code broken from the removal of some members in the <a class="reference internal" href="types.html#module-types" title="types: Names for built-in types."><code class="xref py py-mod docutils literal notranslate"><span class="pre">types</span></code></a>
module.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-unicode">
<code class="descname">unicode</code><a class="headerlink" href="#2to3fixer-unicode" title="Permalink to this definition">¶</a></dt>
<dd><p>Renames <code class="xref py py-class docutils literal notranslate"><span class="pre">unicode</span></code> to <a class="reference internal" href="stdtypes.html#str" title="str"><code class="xref py py-class docutils literal notranslate"><span class="pre">str</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-urllib">
<code class="descname">urllib</code><a class="headerlink" href="#2to3fixer-urllib" title="Permalink to this definition">¶</a></dt>
<dd><p>Handles the rename of <a class="reference internal" href="urllib.html#module-urllib" title="urllib"><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib</span></code></a> and <code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib2</span></code> to the <a class="reference internal" href="urllib.html#module-urllib" title="urllib"><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib</span></code></a>
package.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-ws_comma">
<code class="descname">ws_comma</code><a class="headerlink" href="#2to3fixer-ws_comma" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes excess whitespace from comma separated items.  This fixer is
optional.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-xrange">
<code class="descname">xrange</code><a class="headerlink" href="#2to3fixer-xrange" title="Permalink to this definition">¶</a></dt>
<dd><p>Renames <code class="xref py py-func docutils literal notranslate"><span class="pre">xrange()</span></code> to <a class="reference internal" href="stdtypes.html#range" title="range"><code class="xref py py-func docutils literal notranslate"><span class="pre">range()</span></code></a> and wraps existing <a class="reference internal" href="stdtypes.html#range" title="range"><code class="xref py py-func docutils literal notranslate"><span class="pre">range()</span></code></a>
calls with <a class="reference internal" href="stdtypes.html#list" title="list"><code class="xref py py-class docutils literal notranslate"><span class="pre">list</span></code></a>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-xreadlines">
<code class="descname">xreadlines</code><a class="headerlink" href="#2to3fixer-xreadlines" title="Permalink to this definition">¶</a></dt>
<dd><p>Changes <code class="docutils literal notranslate"><span class="pre">for</span> <span class="pre">x</span> <span class="pre">in</span> <span class="pre">file.xreadlines()</span></code> to <code class="docutils literal notranslate"><span class="pre">for</span> <span class="pre">x</span> <span class="pre">in</span> <span class="pre">file</span></code>.</p>
</dd></dl>

<dl class="2to3fixer">
<dt id="2to3fixer-zip">
<code class="descname">zip</code><a class="headerlink" href="#2to3fixer-zip" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps <a class="reference internal" href="functions.html#zip" title="zip"><code class="xref py py-func docutils literal notranslate"><span class="pre">zip()</span></code></a> usage in a <a class="reference internal" href="stdtypes.html#list" title="list"><code class="xref py py-class docutils literal notranslate"><span class="pre">list</span></code></a> call.  This is disabled when
<code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">future_builtins</span> <span class="pre">import</span> <span class="pre">zip</span></code> appears.</p>
</dd></dl>

</div>
<div class="section" id="module-lib2to3">
<span id="lib2to3-2to3-s-library"></span><h2>26.7.3. <a class="reference internal" href="#module-lib2to3" title="lib2to3: the 2to3 library"><code class="xref py py-mod docutils literal notranslate"><span class="pre">lib2to3</span></code></a> - 2to3’s library<a class="headerlink" href="#module-lib2to3" title="Permalink to this headline">¶</a></h2>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.6/Lib/lib2to3/">Lib/lib2to3/</a></p>
<hr class="docutils" />
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The <a class="reference internal" href="#module-lib2to3" title="lib2to3: the 2to3 library"><code class="xref py py-mod docutils literal notranslate"><span class="pre">lib2to3</span></code></a> API should be considered unstable and may change
drastically in the future.</p>
</div>
</div>
</div>


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  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">26.7. 2to3 - Automated Python 2 to 3 code translation</a><ul>
<li><a class="reference internal" href="#using-2to3">26.7.1. Using 2to3</a></li>
<li><a class="reference internal" href="#fixers">26.7.2. Fixers</a></li>
<li><a class="reference internal" href="#module-lib2to3">26.7.3. <code class="docutils literal notranslate"><span class="pre">lib2to3</span></code> - 2to3’s library</a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
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