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class Dog:
#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!")
my_dog = Dog('willie',6)
print ("my dog's name is "+ my_dog.name.title() +".")
print ("my dog's age is " + str(my_dog.age) +" years old.")