A little example of beginning to think about approaching a elevator in building problem.

building.py

class Building(object):
  """Building 
  has many Elevators
  has many Floors
  """
  def __init__(self, floors, elevators):
    super(Building, self).__init__()
    self.total_floors = floors
    self.floors = [Floor(a) for a in range(floors)]
    self.elevators = [Elevator(a) for a in range(elevators)]

  def get_elevator(self):
    return self.elevators[0]

  def get_nearest(self, current_floor):
    array = sorted(self.elevators, reverse=True, key=lambda x: current_floor-x.current_floor)
    return array[0]


class Floor(object):
  """docstring for Floor"""
  def __init__(self, number = 0):
    super(Floor, self).__init__()
    self.name = "name"
    self.number = number
    self.elevator = None

  def contains_elevator(self):
    return True if self.elevator != None else False

  def set_elevator(self, elevator):
    self.elevator = elevator

  def remove_elevator(self):
    self.elevator = None


class Elevator(object):
  """Elevator
  """
  def __init__(self, number):
    super(Elevator, self).__init__()
    self.number = number
    self.current_floor = 0
    self.direction = 0 #0 = down, 1 = up

  def go(self, floor):
    self.direction = 1 if floor >= self.current_floor else 0
    curr = self.current_floor
    for x in xrange(curr, floor):
      self.current_floor = x
      print("Move to ", x+1)
    

def main():
  bldg = Building(5, 2)
  el = bldg.get_elevator()
  el.go(4)

  n_el = bldg.get_nearest(5)
  print(n_el.current_floor)



if __name__ == '__main__':
  main()