old_contents: """
  operation.py
  ~~~~~~~~~~~~~
  This stores the information of each individual operation in the
  production line.
   - machine is the machine in which that operation will be executed
   - duration is the amount of time in which the operation will be completed
   - job is the set of operations needed to fully build a radiator
   - order determines the relative order among a set of operations that belog
   to the same job
  """
  class Operation:
      def __init__(self, machine, duration, job, order, op_id):
          self.machine = machine
          self.duration = duration
          self.job = job
          self.order = order
          self.op_id = op_id
  
      def __str__(self):
      	return ("Job#" + str(self.job) + " Order#" + str(self.order) +
      	" Machine#" + str(self.machine) + " Duration=" + str(self.duration))
  
new_contents: """
  operation.py
  ~~~~~~~~~~~~~
  This stores the information of each individual operation in the
  production line.
   - machine is the machine in which that operation will be executed
   - duration is the amount of time in which the operation will be completed
   - job is the set of operations needed to fully build a radiator
   - order determines the relative order among a set of operations that belog
   to the same job
  """
  class Operation:
      def __init__(self, machine, duration, job, order, op_id):
          self.machine = machine
          self.duration = duration
          self.job = job
          self.order = order
  
      def __str__(self):
      	return ("Job#" + str(self.job) + " Order#" + str(self.order) +
      	" Machine#" + str(self.machine) + " Duration=" + str(self.duration))
  
subject: Quit operation id