Python入门到实践（9）-类的继承

# -*- coding: utf-8 -*-
"""
Created on Mon Dec 04 21:22:37 2017

@author: Echo
"""

#类的继承
class Car():#父类
"""一次模拟汽车的尝试"""

def __init__(self,make,model,year):
self.make=make
self.model=model
self.year=year
self.odometer_reading=0 #制定属性的默认值

def get_descriptive_name(self):
long_name=str(self.year)+' '+self.make+' '+self.model
return long_name.title()

def read_odmeter(self):
print("This car has "+str(self.odometer_reading)+"miles on it!")

def update_odmeter(self,mileage):#防止私自修改历程数属性
if mileage>=self.odometer_reading:
self.odometer_reading-mileage
else:
print("请输入大于当前里程的数值")
def fill_gas_tank():
print("This Car dosen't have gas")

class ElectriCar(Car): #子类
def __init__(self,make,model,year):
Car.__init__(self,make,model,year)
self.battery=70#添加子类属性

def discribe_barrery(self):#添加子类方法
print("This car has "+str(self.battery)+"- KWh battery!")

def fill_gas_tank():#重写父类方法
print("This Car dosen't need a gas tank!")
my_electricar=ElectriCar('tesla','A3',2015)
print(my_electricar.get_descriptive_name())

class Battery():#电池类
def __init__(self,battery_size=70):
self.battery_size=battery_size

def describe_battery():
print("This car has "+str(self.battery)+"- KWh battery!")

class ElectriCarNew(Car): #子类
def __init__(self,make,model,year):
Car.__init__(self,make,model,year)
self.battery=Battery()#使用实例作为其他类的属性