python类

#!/usr/bin/python
#coding=utf-8
#好好学习，天天向上
class Dog:
      """一次模拟小狗的简单尝试"""
      def __init__(self,name,age):
          """初始化属性名字和年龄"""
          self.name = name
          self.age = age
      def sit(self):
          """模拟小狗蹲下"""
          print(f"{self.name} is now sitting.")
      def roll_over(self):
          """模拟小狗打滚"""
          print(f"{self.name} rolled over!")
my_dog = Dog('tim',6)
my_dog.sit()
my_dog.roll_over()
print(f"my dog name is {my_dog.name} and age is {my_dog.age} years old")