code: def print_solution(solution):
      
      total_cost = 0
      for solution in solution.routes():
          cost = solution.length()
          total_cost = total_cost + cost
          print('{}: {}'.format(solution, cost))
          #print('xxx')
      print('Total cost: {}'.format(total_cost))
docs: Prints a solution
      
      Arguments
      ---------
      solution : BaseSolution
  
      Example
      -------
      ::
      
          [8, 9, 10, 7]: 160
          [5, 6]: 131
          [3, 4, 2]: 154
          Total cost: 445