#!/usr/bin/python

def read_route_data():
  routesList = []
  with open("routes.txt", "rt") as in_file:
    routes = in_file.read()
  tempList = routes.split(',')
  i = 0
  while i < tempList.len:
    x = tempList[i]
    i = i + 1
    y = tempList[i]
    routesList.append({'route_number': x, 'happy_ratio': y})

  return routesList

while True:
  try:
    n = input ("How many routes can have an extra bus? ")
    n = int (n)
  except ValueError:
      print ("Invalid value. Please enter a non-negative integer")
      continue
  if n < 0:
      print("Invalid value. Please enter a non-negative integer")
      continue
  else:
    break
route = read_route_data