class Employee(Person):
 POSITIONS = ("Superwiser", "Manager", "CEO", "Founder")

 def __init__(self, name, id, department):
 self.name = name
 self.id = id
 self.department = department
 self.age = None
 self._age_last_calculated = None
 self._recalculated_age()

 def __str__(self):
 return ("Name: " + self.name + "\nDepartment: "
 + self.department)
 
 @classmethod
 def no_position_allowed(cls, position):
 return [t for t in cls.POSITIONS if t != position]

 

 @staticmethod
 def c_positions(position):
 return [t for t in cls.TITLES if t in position]

 @property
 def id_with_name(self):
 return self.id, self.name

 def age(self):
 if (datetime.date.today() > self._age_last_recalculated):
 self.__recalculated_age()
 return self.age


 def _recalculated_age(self):
 today = datetime.date.today()
 age = today.year - self.birthday.year
 if today < datetime.date(
 today.year, self.birthday.month,
 self.birthday.year):
	 age -= 1
 self.age = age
 self._age_last_recalculated = today