python--从入门到实践--chapter 9 类

class Name(Father_class):
		def __init__(self, para, ...):
				self.para = x
		def __init__(self, para, ...):
				super().__init__(para, ...)	#调用父类的构造函数

class Car():
	def __init__(self,make,model,year):	#构造函数
		self.make = make
		self.model = model
		self.year = year
		self.odometer_reading = 0
	def get_descriptive_name(self):
		long_name = str(self.year) + ' ' + self.make + ' ' + self.model
		return long_name.title()
	def read_odometer(self):
		print('This car has ' + str(self.odometer_reading) + ' miles on it.')
	def update_odometer(self,mileage):
		if mileage >= self.odometer_reading:
			self.odometer_reading = mileage
		else:
			print('You can not roll back an odometer！')
	def increment_odometer(self, miles):
		if miles < 0:
			print('You can cheat me！ driving miles < 0')
		else:
			print('driving this car ' + str(miles) + 'miles')
			self.odometer_reading += miles
	def fill_gas_tank(self):
		print('This car need fill gas !')

class Battery():
	def __init__(self, battery_size=70):	#构造函数，带默认参数值
		self.battery_size = battery_size
	def describe_battery(self):
		print('This car has a ' + str(self.battery_size) + '-KWh battery.')
	def upgrade_battery(self):
		if self.battery_size != 85:
			self.battery_size = 85
			print("battery update successfully !")
	def get_range(self):
		if self.battery_size == 70:
			range = 240
		elif self.battery_size == 85:
			range = 270
		message = 'This car can go approximately ' + str(range)
		message += ' miles on a full charge.'
		print(message)

class ElectricCar(Car):		#类的继承
	def __init__(self, make, model, year):
		super().__init__(make, model, year)	#调用父类初始化函数初始化父类成员
		self.battery = Battery()			#新的成员，一个Battery对象
	def fill_gas_tank(self):
		# super().fill_gas_tank()
		print('This car doesn\'t need a gas tank!')

my_tesla = ElectricCar('tesla','model s', 2019)
print(my_tesla.get_descriptive_name())
my_tesla.battery.describe_battery()
my_tesla.fill_gas_tank()
my_tesla.battery.get_range()
my_tesla.battery.upgrade_battery()
my_tesla.battery.get_range()