class Dog(): #创建类
"""一次模拟小狗的简单尝试"""
def __init__(self,name,age):
"""初始化属性name和age"""
self.name = name
self.age = age
def sit(self):
"""模拟小狗被命令时蹲下"""
print(self.name.title()+ "is now sitting.")
def roll_over(self):
"""模拟小狗被命令时打滚"""
print(self.name.title()+"roll over!")
obj=Dog('whille', 6) #根据类创建实例
print(obj.name)
obj.sit()
obj.roll_over()
class Car(): #Car类
"""一次模拟汽车的简单尝试"""
def __init__(self,make,model,year,):
"""初始化描述汽车的属性"""
self.make = make
self.model = model
self.year = year
self.odometer_reading = 0 #给属性指定默认值
def get_descriptive_name(self):
"""返回整洁的信息"""
long_name = str(self.year)+' '+self.make + ' '+self.model
print(long_name)
return long_name.title()
def read_odometer(self):
"""打印一条指出汽车里程的信息"""
print("This car has " + str(self.odometer_reading) + " miles on it ")
def update_odometer(self, mileage): #用方法修改属性的值
self.odometer_reading = mileage
new_car = Car('audi','a4',2016)
new_car.get_descriptive_name()
new_car.odometer_reading = 23 #直接修改属性默认值
new_car.read_odometer()
