python面向对象（class，属性，方法）

封装：属性+方法

>>> class turtle:
	color = 'green'
	def climb(self):
		print('我很努力')
>>> tt = turtle()
>>> tt.climb()
我很努力

继承

>>> class Mylist(list):
	pass

>>> list2 = Mylist()
>>> list2.append(3)
>>> list2
[3]

多态

>>> class A:
	def fun(self):
		print('我是小A')

		
>>> class B:
	def fun(self):
		print('我是小B')

		
>>> a = A()
>>> b = B()
>>> a.fun()
我是小A
>>> b.fun()
我是小B

init方法

>>> class Ball:
	def __init__(self,name):
		self.name = name
	def kick(self):
		print('我叫%s，该死的，谁踢我……' % self.name)
>>> b = Ball('tudou')
>>> b.kick()
我叫tudou，该死的，谁踢我……

私有变量

>>> class Person:
	__name = '小甲鱼'
	def getName(self):
		return self.__name
>>> p = Person()
>>> p.getName()
'小甲鱼'
>>> p._Person__name
'小甲鱼'

继承深化

import random as r
class Fish:
    def __init__(self):
        self.x = r.randint(0,10)
        self.y = r.randint(0,10)
    def move(self):
        self.x -= 1
        print('我的位置是：',self.x,self.y)
class Goldfish(Fish):
    pass
class Carp(Fish):
    pass
class Salmon(Fish):
    pass
class Shark(Fish):
    def __init__(self):
    	super().__init__()
        self.hungry = True
    def eat(self):
        if self.hungry:
            pirnt('吃货的梦想就是天天有的吃^_^')
            self.hungry = False
        else:
            print('太撑了，吃不下了')

多继承

>>> class Base1:
	def foo1(self):
		print('我是foo1')		
>>> class Base2:
	def foo2(self):
		print('我是foo2')		
>>> class C(base1,base2):
	pass

在类的方法里面，self是必须要的参数，代表类的实例，要实例化就得要有这个标志
组合

>>> class Turtle:
	def __init__ (self,x):
		self.num = x
>>> class Fish:
	def __init__(self,x):
		self.num = x
>>> class Pool:
	def __init__(self,x,y):
		self.turtle = Turtle(x)
		self.fish = Fish(y)
	def print_num(self):
		print('水池里总共有乌龟%d只,小鱼%d条！' % (self.turtle.num,self.fish.num))
>>> pool = Pool(1,10)
>>> pool.print_num()
水池里总共有乌龟1只,小鱼10条！
>>> class CC:
	mark = 1
	def setXY(self,x,y):
		self.x = x
		self.y = y
	def printXY(self):
		print(self.x,self.y)
>>> dd = CC()
>>> dd.__dict__
{}
>>> dd.setXY(2,3)
>>> dd.__dict__
{'x': 2, 'y': 3}
>>> del CC
>>> dd.printXY()
2 3

属性名用名词，方法名用动词