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  <div class="section" id="module-__builtin__">
<h1>27.2. <tt class="xref docutils literal"><span class="pre">__builtin__</span></tt> &#8212; Built-in objects<a class="headerlink" href="#module-__builtin__" title="Permalink to this headline">¶</a></h1>
<p>This module provides direct access to all &#8216;built-in&#8217; identifiers of Python; for
example, <tt class="docutils literal"><span class="pre">__builtin__.open</span></tt> is the full name for the built-in function
<a title="open" class="reference external" href="functions.html#open"><tt class="xref docutils literal"><span class="pre">open()</span></tt></a>.</p>
<p>This module is not normally accessed explicitly by most applications, but can be
useful in modules that provide objects with the same name as a built-in value,
but in which the built-in of that name is also needed.  For example, in a module
that wants to implement an <a title="open" class="reference external" href="functions.html#open"><tt class="xref docutils literal"><span class="pre">open()</span></tt></a> function that wraps the built-in
<a title="open" class="reference external" href="functions.html#open"><tt class="xref docutils literal"><span class="pre">open()</span></tt></a>, this module can be used directly:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">__builtin__</span>

<span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="n">path</span><span class="p">):</span>
    <span class="n">f</span> <span class="o">=</span> <span class="n">__builtin__</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">&#39;r&#39;</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">UpperCaser</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>

<span class="k">class</span> <span class="nc">UpperCaser</span><span class="p">:</span>
    <span class="sd">&#39;&#39;&#39;Wrapper around a file that converts output to upper-case.&#39;&#39;&#39;</span>

    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">f</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_f</span> <span class="o">=</span> <span class="n">f</span>

    <span class="k">def</span> <span class="nf">read</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">count</span><span class="o">=-</span><span class="mi">1</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_f</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">count</span><span class="p">)</span><span class="o">.</span><span class="n">upper</span><span class="p">()</span>

    <span class="c"># ...</span>
</pre></div>
</div>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> Most modules have the name <tt class="docutils literal"><span class="pre">__builtins__</span></tt> (note the <tt class="docutils literal"><span class="pre">'s'</span></tt>) made available
as part of their globals.  The value of <tt class="docutils literal"><span class="pre">__builtins__</span></tt> is normally either
this module or the value of this modules&#8217;s <tt class="xref docutils literal"><span class="pre">__dict__</span></tt> attribute.  Since
this is an implementation detail, it may not be used by alternate
implementations of Python.</p>
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