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class="literal">platform</code> module. The local context is where new variables will be created:<pre class="programlisting">        globals = {'__builtins__':__builtins__, 
                   'Path': Path, 
                   'platform': platform} 
        locals = {} 
        exec(code, globals, locals) 
        return locals['Configuration'] 
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<li class="listitem">This returns only the defined <code class="literal">Configuration</code> class from the locals which are set by the executed module. Any other variables will be ignored.</li>
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<div class="section" title="How it works..."><div class="titlepage"><div><div><h2 class="title"><a id="ch13lvl2sec560"></a>How it works...</h2>
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<p>The details of the Python language—syntax and semantics—are embodied in the <code class="literal">compile()</code> and <code class="literal">exec()</code> functions. The <code class="literal">exec()</code> function reflects the way Python handles global and local variables. There are two namespaces provided to this function. The global <code class="literal">namespace</code> instance includes <code class="literal">__builtins__</code> plus a class and module that might be used in the file.</p>
<p>The local variable namespace will have the new class created in it. This namespace has a <code class="literal">__dict__</code> attribute that makes it accessible via dictionary methods. Because of this, we can then extract the class by name. The function returns the class object for use throughout the application.</p>
<p>We can put any kind of object into the attributes of a class. Our example showed mapping objects. There's no limitation on what can be done when creating attributes at the class level.</p>
<p>We can have complex calculations within the <code class="literal">class</code> statement. We can use this to create attributes which are derived from other attributes. We can execute any kind of statement, including <code class="literal">if</code> statements and <code class="literal">for</code> statements to create attribute values.</p>
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<div class="section" title="There's more..."><div class="titlepage"><div><div><h2 class="title"><a id="ch13lvl2sec561"></a>There's more...</h2>