继承的基本语法
class Class(继承那个基类如果有多个基类用逗号隔开，如果没有就继承object):
""" 类的帮助信息"""
类体
方法重写
派生类中调用基类的__init__()方法
方法重写
在派生类中重写方法
在派生类中调用基类的__init__()方法
super()可以在派生类当中调用基类的构造方法
例
class Car():
"""一次模拟汽车的简单尝试"""
def __init__(self, make, model, year):
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't roll back an odometer!")
def increment_odometer(self, miles):
self.odometer_reading += miles
class Battery():
def __init__(self, battery_size = 70):
self.battery_size = battery_size
def print_battery(self):
print(self.battery_size)
def get_range(self):
"""打印一条消息，指出电瓶的续航里程"""
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)
def upgrade_battery(self):
if self.battery_size != 85:
self.battery_size = 85
print(self.battery_size)
class ElectricCar(Car):
#电动汽车的独特之处
def __init__(self, make, model, year):
#初始化父类的属性
super().__init__(make, model, year)
self.battery =Battery()
my_tesla = ElectricCar('tesla', 'model s', 2016)
print(my_tesla.get_descriptive_name())
my_tesla.battery.upgrade_battery()
my_tesla.battery.print_battery()
my = ElectricCar('tesla', 'model s', 2017)
my.battery.get_range()
my.battery.upgrade_battery()
my.battery.get_range()