span><span class="operator">.</span><span class="name">get</span><span class="punctuation">(</span><span class="literal string">'RATE'</span><span class="punctuation">)</span>
</pre>
<p>In the first case(ofile variable), direct access, KeyError exception may be sent if variable name does not exist.
In the second example(rate variable), None value will be returned if not found.</p>
</div>
<div class="section" id="environment-tree">
<h1>Environment Tree</h1>
<p>Environment files are evaluated in hierarchical 