python 类的一个例子

class Dog():
    """this class definite a class of a dog"""
    def __init__(self,name,age,master='robert'):
        self.name = name   # attribute
        self.a = age    #   attribute
        self.m = master    #  attribute
        self.typee = 'animal'  #  attribute
    def sit(self):   # method mush have a self
        print(self.name.title() + " is sitting.")
    def roll_over(self):
        print(self.name.title() + " rolled over.")
    def master(self):
        print(self.name.title() + " 's master is " + self.m)
    def type(self):
        print(self.name.title() + " 's type is " + self.typee + ".")
    def age(self):
        print(self.name.title() + " 's age is " + self.a)
    def met(self):       #every method mush have a postional argument self
        print("This is a method!!!")
dog1 = Dog('robert','25')
dog1.sit()
dog1.roll_over()
dog1.master()
dog1.type()
dog1.age()
dog1.met()