约束和假设
- 我们应该支持哪种类型的车辆？
- motorcycle, Car, Bus
- 每种车型占用的停车位数量是否不同？
- Yes
- Motorcycle spot -> Motorcycle
- Compact spot -> Motorcycle, Car
- Large spot -> Motorcycle, Car
- Bus can park if we have 5 consecutive “large” spots
- 停车场是否有多层？
- Yes
编码实现
from abc import AMCMeta, abstractmethod
class VehicleSize(Enum):
MOTORCYCLE = 0
COMPACT = 1
LARGE = 2
class Vehicle(metaclass=ABCMeta):
def __init__(self, vehicle_size, license_plate, spot_size):
self.vehicle_size = vehicle_size
self.license_plate = license_plate
self.spot_size = spot_size
self.spots_taken = []
def clear_spots(self):
for spot in self.spots_taken:
spot.remove_vehicle(self)
self.spots_taken = []
def take_spot(self, spot):
self.spots_taken.append(spot)
@abstractmethod
def can_fit_in_spot(self,spot):
pass
class Motorcycle(Vehicle):
def __init__(self, license_plate):
super(Motorcycle, self).__init__(VehicleSize.MOTORCYCLE, license_plate, spot_size=1)
def can_fix_in_spot(self, spot):
return true
class Car(Vehicle):
def __init__(self, license_plate):
super(Car, self).__init__(VehicleSize.COMPACT, license_plate, spot_size)
def can_fit_in_spot(self, spot):
return True if (spot.size == LARGE or spot.size == COMPACT) else False
class Bus(Vehicle):
def __init__(self, license_plate):
super(Bus, self).__init__(VehicleSize.LARGE, license_plate, spot_size=5)
def can_fit_in_spot(self, spot):
return True if spot.size == LARGE else False
class ParkingLot(object):
def __init__(self, num_levels):
self.num_levels = num_levels
self.levels = []
def park_vehicle(self, vehicle):
for level in levels:
if level.park_vehicle(vehicle):
return True
return False
class Level(object):
SPOTS_PER_ROW = 10
def __init__(self, floor, total_spots):
self.floor = floor
self.num_spots = total_spots
self.available_spots = 0
self.parking_spots = []
def spot_freed(self):
self.available_spots += 1
def park_vehicle(self, vehicle):
spot = self._find_available_spot(vehicle)
if spot is None:
return None
else:
spot.park_vehicle(vehicle)
return spot
def _find_available_spot(self, vehicle):
'''Find an available spot where vehicle can fix, or return None'''
def _park_starting_at_spot(self, spot, vehicle):
'''Occupy starting at spot.spot_number to vehicle.spot_size'''
class ParkingSpot(object):
def __init__(self, level, row, spot_numberm, spot_size, vehicle_size):
self.level = level
self.row = row
self.spot_numer = spot_number
self.spot_size = spot_size
self.vehicle_size = vehicle_size
self.vehicle = None
def is_available(self):
return True if self.vehicle is None else False
def can_fit_vehicle(self, vehicle):
if self.vehicle is not None:
return False
return vehicle.can_fit_in_spot(self)
def park_vehicle(self, vehicle): #...
def remove_vehicle(self): #...
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