创建和使用类

#!/usr/bin/python
class Dog():
    """一次模拟小狗的简单的尝试"""
    def __init__(self,name,age):
        """初始化属性name,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 string.")
        
    def roll_over(self):
        """模拟小狗被命令时打滚"""
        print(self.name.title() + " rolled over!")
        
my_dog = Dog("Tom",10)
print("My dog's name is " + my_dog.name.title() + ".")
print("My dog is " + str(my_dog.age) + " years old.")
my_dog.sit()
my_dog.roll_over()