【python】初识python

#!/usr/bin/python
# -*- coding:UTF-8 -*-

class Dog():
    #construct
    #类变量可以不用显式定义在类的头部 但是最好不要这样做
    #类变量不显式区分public 和 private, 隐式规则:变量前缀是__，则表示该变量是private变量，否则为public
    def __init__(self, name, age):
        self.name = name
        self.age = age 
        
    def sit(self):
        print(self.name.title() + " is now sitting")

    def roll_over(self):
        print(self.name.title() + " rolled over")


dog = Dog("dabai", 10) 
dog.sit()
dog.roll_over();
print dog.name

#!/usr/bin/python
# -*- coding:UTF-8 -*-

class Animal():
    def __init__(self, animal_type, name):
        self.animal_type = animal_type;
        self.name = name;

class Dog(Animal):
    def __init__(self, name, age):
        self.name = name
        #python2的语法
        #python3的语法: super().__init__(param1, param2, ...)
        Animal.__init__(self, "reptiles", name)
        self.age = age 
        self.animal_type = "reptiles"
    
    def sit(self):
        print(self.name.title() + " is now sitting")

    def roll_over(self):
        print(self.name.title() + " rolled over")

dog = Dog("dabai", 10)
dog.sit()
dog.roll_over();
print dog.name
print dog.animal_type