#创建和使用类
class Dog():
def __init__(self,name,age):
self.name = name
self.age = age
def sit(self):
print(self.name.title()+" is now sitting.")
def roll_over(self):
print(self.name.title() + " rolled over!")
#创建实例:
my_dog = Dog('willie',6)
#访问属性:
my_dog.name
my_dog.roll_over()
#使用类和实例
class Car():
def __init__(self,make,model,year):
self.make=make
self.model=model
self.year=year
def get_descriptive_name(self):
long_name=str(self.year)+' '+self.make + ' '+self.model
return long_name.title()
my_newcar = Car('audi','a4','2016')
print(my_newcar.get_descriptive_name())
#给属性指定默认值
class Car():
def __init__(self,make,model,year):
self.make=make
self.model=model
self.year=year
self.odometer_reading=0 #添加默认值
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
#修改类属性值
my_new_car=Car('audi','a4','2016')
my_new_car.odometer_reading = 23
my_new_car.read_odometer()
#继承
class ElectricCar(Car):
def __init__(self,make,model,year):
#初始化父类属性
super().__init__(make,model,year)
my_tesla=ElectricCar('tesla','model s','2016')
print(my_tesla.get_descriptive_name())
#重写父类方法
class ElectricCar(Car):
def __init__(self,make,model,year):
#初始化父类属性
super().__init__(make,model,year)
self.battery_size = 70
[Python]《从入门到实践》第九章-类
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转载自blog.csdn.net/TOMOCAT/article/details/81209084
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