title: Tuple/Float Arithmetic in Python
body: <p>For this simple expression:</p>
  
  <pre><code>polyResult = polyResult + poly[len(poly)-1:]
  </code></pre>
  
  <p>I receive a</p>
  
  <pre><code>TypeError: unsupported operand type(s) for +: 'float' and 'tuple'
  </code></pre>
  
  <p>polyResult is a float, so I tried to convert the tuple value to a float and received the subsequent error:</p>
  
  <pre><code>polyResult = polyResult + float(poly[len(poly)-1:])
  
  float() argument must be a string or a number
  </code></pre>
  
  <p>I also tried <code>polyResult += float(poly[len(poly)-1:])</code> without success.</p>
  
  <p>Given that the tuple value being called is a float, I don't understand why I am receiving an error that indicates the value is not a number. What am I missing?</p>