Python入門到實踐（9）-類的繼承

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

@author: Echo
"""

#類的繼承
class Car():#父類
    """一次模擬汽車的嘗試"""
    
    def __init__(self,make,model,year):
        self.make=make
        self.model=model
        self.year=year
        self.odometer_reading=0 #制定屬性的默認值

    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):#防止私自修改歷程數屬性
        if mileage>=self.odometer_reading:
            self.odometer_reading-mileage
        else:
            print("請輸入大於當前里程的數值")
    def fill_gas_tank():
        print("This Car dosen't have gas")

class ElectriCar(Car): #子類
    def __init__(self,make,model,year):
        Car.__init__(self,make,model,year)
        self.battery=70#添加子類屬性 
    
    def discribe_barrery(self):#添加子類方法
        print("This car has "+str(self.battery)+"- KWh battery!")
    
    def fill_gas_tank():#重寫父類方法
        print("This Car dosen't need a gas tank!")
my_electricar=ElectriCar('tesla','A3',2015)
print(my_electricar.get_descriptive_name())


class Battery():#電池類
    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): #子類
    def __init__(self,make,model,year):
        Car.__init__(self,make,model,year)
        self.battery=Battery()#使用實例作爲其他類的屬性