title: How to reset/restart a program in Python from user input?
body: <p>I would like to reset/restart my program but based on a user input. So say if the user types "yes" and clicks enter, the program will reset/restart and start fresh. I am making a calculator for energy; Physics problems. The out puts are Mechanical Energy, Kinetic Energy, and Potential Energy. All the formulas are coded properly, everything is working as expected, except I have no way to restart the program without clicking back on the file and reopening.</p>
  
  <pre><code>#Importing "time" and "math" so I can use the time.sleep and rounding functions
  import time
  import math
  restart=1
  user_r1=float(input ("What is the mass of your object (kg) = "))
  print ("")
  user_r2=float(input ("Whats is the height you are dropping from (m) = "))
  print ("")
  user_r3=float(input ("What is the velocity (m/s) = "))
  #Formulas that solve from the inputs given
  EKinetic = 0.5 * user_r1 * user_r3 * user_r3
  EPotential = user_r1 * 9.81 * user_r2
  MechEnergy = (EPotential) + (EKinetic)
  #Rounding - To change the ammount of sigdigs change the # infront of the f'
  EKinetic='%.1f' % EKinetic
  EPotential='%.1f' % EPotential
  MechEnergy='%.1f' % MechEnergy
  #Spitting out the info the user will see
  print ("")
  print ("===============================================================================")
  print ("Kinetic Energy = ",EKinetic,"J")
  print ("")
  print ("Potential Energy = ",EPotential,"J")
  print ("")
  print ("Mechanical Energy = ",MechEnergy,"J")
  print ("===============================================================================")
  print ("")
  #This time.sleep will make the program pause for (x# of seconds)
  time.sleep(3)
  user_r4=(input ("To do another calculation type yes and hit enter = "))
  if user_r4 == ("yes"):
      print ("YAY")
      ###PUT RESTART CODE HERE###
      ###EVERYTHING DOWN ARE JUST PLACE HOLDERS FOR THE RESTART CODE###
  else:
      print ("Please type yes to continue")
  time.sleep(1)
  user_r4=(input ("To do another calculation type yes and hit enter = "))
  if user_r4 == ("yes"):
      print ("YAY")
      ###PUT RESTART CODE HERE###
  else: print ("Thats enough!!!")
  time.sleep(3)
  </code></pre>