title: python addition asking from the user
body: <p>The math statement is "add x1 and x2"</p>
  
  <p>The output of python is:<br>
  Enter the statement or "E" to exit the program: </p>
  
  <p>Then user inputs:<br>
  add 35 and 5</p>
  
  <p>The output is:<br>
  Answer: add 35 and 5 = 40</p>
  
  <p>How to use python to code this output?<br>
  Enter the statement or "E" to exit the program: add 35 and 5<br>
  Answer: add 35 and 5 = 40</p>