200412_pyhon类和对象

静态方法与类方法.md

class A():
    count = 0
    def __init__(self):
        A.count += 1
    @classmethod #参数指向当前类
    def kid(cls):
        print('A has',cls.count,'little objects')
    @staticmethod#静态方法 不需要参数 仅仅组织代码
    def static_method():
        print('Static method called')
easy_a = A()
breezy_a = A()
wheezy_a = A()
A.count

魔法方法

'ha' =='HA'#False

class Word():
    def __init__(self,text):
         self.text = text
    def equals(self,word2):
        return self.text.lower() == word2.text.lower()  

first = Word('ha')
second = Word('HA')
first == second#False
first.equals(second)#True

class Word():
    def __init__(self,text):
         self.text = text
    def __eq__(self,word2):## 区别第一个的 defequals(self,word2):
        return self.text.lower() == word2.text.lower()    

first = Word('ha')
second = Word('HA')
first == second#True

repr : print输出的东西

class Word():
    def __init__(self,text):
         self.text = text
    def equals(self,word2):
        return self.text.lower() == word2.text.lower()    
    def __str__(self):
        return self.text
    def __repr__(self):# 变量输出什么
        return 'Word("'+self.text +'")'

first = Word('ha')
print(first)#ha