Python建造者模式案例运行原理解析

MINI14 = '1.4GHz Mac mini'
class AppleFactory:
	class MacMini14:
		def __init__(self):
			self.memory = 4 # 单位为GB
   self.hdd = 500 # 单位为GB
   self.gpu = 'Intel HD Graphics 5000'
		def __str__(self):
			info = ('Model: {}'.format(MINI14),'Memory: {}GB'.format(self.memory),'Hard Disk: {}GB'.format(self.hdd),'Graphics Card: {}'.format(self.gpu))
			return '\n'.join(info)
	def build_computer(self, model):
		if (model == MINI14):
			return self.MacMini14()
		else:
			print("I dont't know how to build {}".format(model))
if __name__ == '__main__':
	afac = AppleFactory()
	mac_mini = afac.build_computer(MINI14)
	print(mac_mini)

class Computer:
	def __init__(self, serial_number):
		self.serial = serial_number
		self.memory = None # 单位为GB
		self.hdd = None # 单位为GB
		self.gpu = None
	def __str__(self):
		info = ('Memory: {}GB'.format(self.memory),'Hard Disk: {}GB'.format(self.hdd),'Graphics Card: {}'.format(self.gpu))
		return '\n'.join(info)
class ComputerBuilder:
	def __init__(self):
		self.computer = Computer('AG23385193')
	def configure_memory(self, amount):
		self.computer.memory = amount
	def configure_hdd(self, amount):
		self.computer.hdd = amount
	def configure_gpu(self, gpu_model):
		self.computer.gpu = gpu_model
class HardwareEngineer:
	def __init__(self):
		self.builder = None
	def construct_computer(self, memory, hdd, gpu):
		self.builder = ComputerBuilder()①
		[step for step in (self.builder.configure_memory(memory),self.builder.configure_hdd(hdd),self.builder.configure_gpu(gpu))]
	@property
	def computer(self):
		return self.builder.computer
def main():
	engineer = HardwareEngineer()
	engineer.construct_computer(hdd=500, memory=8, gpu='GeForce GTX 650 Ti')
	computer = engineer.computer
	print(computer)
if __name__ == '__main__':
	main()