task10 python 类和对象

类与实例

class Car:
    price = 100000         #定义类属性
    def __init__(self, c):
        self.color = c     #定义实例属性


car1 = Car("Red")          #实例化对象
car2 = Car("Blue")

#查看实例属性和类属性的值
print(car1.color, Car.price)
#修改类属性
Car.price = 110000
#动态增加类属性
Car.name = 'QQ'
#修改实例属性
car1.color = "Yellow"
print(car2.color, Car.price, Car.name)
print(car1.color, Car.price, Car.name)

#
import types

def setSpeed(self, s):
    self.speed = s

car1.setSpeed = types.MethodType(setSpeed, car1)     #动态增加成员方法
car1.setSpeed(50)                                    #调用成员方法
print(car1.speed)