old_contents: from datetime import datetime
  
  class Product():
      def __init__(self, cost, name, date):
          self.cost = cost
          self.name = name
          self.date = date
          self.passed_phases = set()
  
      def days_left(self):
          return datetime.now() - self.date
  
  
  if __name__ == '__main__':
      main()
  
  
  def main():
  
new_contents: from datetime import datetime
  
  class Product():
      def __init__(self, cost, name, date):
          self.cost = cost
          self.name = name
          self.date = date
          self.passed_phases = set()
  
      def days_left(self):
          return datetime.now() - self.date
  
  
  def main():
      products = None
      best = {'vector': random_permutation(products)}
  
  
  if __name__ == '__main__':
      main()
  
  
  def random_permutation(products):
      pass
  
subject: Call random_permutation from main