title: Python concatenation of string and integer sum
body: <p>I want to print sum of numbers and some string like:</p>
  
  <pre><code>print("root: " + rootLeaf + " left:" + leftLeaf + "sum: " +(rootLeaf+leftLeaf) )
  </code></pre>
  
  <p>here "root", "left" and "sum" is string where as rootLeaf and leftleaf are integers and i want to find their sum.</p>
  
  <p>I checked the <a href="https://stackoverflow.com/questions/2847386/python-string-and-integer-concatenation">post here</a> but i couldn't achieve the sum of the integers 
  (math operation in string concatination)</p>