For Ethan

while True:
  try:
    route = input ("Please enter the route number: ")
    route = int (route)
  except ValueError:
      print ("Invalid route number. Please enter a positive integer.")
      continue

  if route < 1:
      print("Invalid route number. Please enter a positive integer.")
      continue

  else:

    break

while True:
  try:
    stop = input ("Please enter the number of stops on this route: ")
    stop = int(stop)
  except ValueError:
    print ("Invalid number of stops. Please enter a positive integer.")
    continue

  if stop < 1:
      print("Invalid number of stops. Please enter a positive integer.")
      continue

  if stop == 1:
      print("Invalid number of stops. There must be at least two stops on the route.")
      continue

  else:

    break


while True:
  try:
    passengers_waiting = input ("How many passengers were waiting for the bus at stop #1?")
    passengers_waiting = int(passengers_waiting)
  except ValueError:
    print("Invalid number of passengers. Please enter a non-negative integer.")
    continue

  if passengers_waiting < 0:
    print("Invalid number of passengers. Please enter a non-negative integer.")
    continue

  else:

    break


while True:
  try:
    passengers_left = input ("How many passengers left the bus at stop #2?")
    passengers_left = int(passengers_left)
  except ValueError:
    print("Invalid number of passengers. Please enter a non-negative integer.")
    continue

  if passengers_left < 0:
    print ("Invalid number of passengers. Please enter a non-negative integer.")
    continue

  else:

    break

print ("Route number:" ,route,"")
print ("Happy customers: ",passengers_waiting,"")
print ("Unhappy customers: ",passengers_left,"")
print ("Ratio of happy to unhappy customers: ")