title: Calculation based on the reference to another key in a dictionary,
body: <p>If two dictionaries are given :</p>
  <pre><code>valuedict = {1: 10.0, 2: 20.0, 3:30.0}
  Vardict1    = {'Var1' : &quot;1 + 2 + 3&quot;, 'Var2' : &quot;2&quot; , 'Var3':  &quot;1 + 2&quot;, 'Var4' : &quot;3 - 2&quot;}
  </code></pre>
  <p>How to create a new dictionary with the Calculation of values based upon the expression.</p>
  <pre><code>Output :- {'Var1' : 60.0, 'Var2': 20.0, 'Var3': 30.0, 'Var4': 10.0} 
  </code></pre>