title: How to restart a program at a certain point in Python
body: <p>So I made a very primitive and probably inefficient calculator today (first time using Python), and I want to be able to continue doing more problems, how would I do so? Here is my "calculator" app..</p>
  
  <pre><code>import time
  print ("Welcome. This is a calculator that uses the function: A (operator) B.")
  time.sleep(3.5)
  print ("Available operators include: Addition, Subtraction, Multiplication, Division,        Exponent, and Remainder division.")
  time.sleep(3.5)
  a = float(input("Type in a value of A. "))
  b = float(input("Type in a value of B. "))
  operb = input("Would you like to: Add - Subtract - Multiply - Divide - Exponent - or Remainder? ")
  opera = operb.lower()
  if (opera) == "add":
      print ((a) + (b))
  elif (opera) == "subtract":
      print ((a) - (b))
  elif (opera) == "multiply":
      print ((a) * (b))
  elif (opera) == "divide":
      print ((a) / (b))
  elif (opera) == "exponent":
      print ((a) ** (b))
  elif (opera) == "remainder":
      print ((a) % (b))
  else:
      print ("Invalid operation.")
  cont = input("Would you like to do another problem?")
  cont = cont.lower()
  if (cont) == "yes":
      ??
  else:
      quit
  </code></pre>
  
  <p>I want it to restart at the "Type in a value of A." part, but I'm not sure how to do that.</p>