python类

# # -*- coding:UTF-8 -*-
# # -*- coding: UTF-8 -*-
# # 注意类名后面有个冒号，在block块里面就可以定义属性和方法了。当一个类定义完之后，就产生了一个类对象。类对象支持两种操作：引用和实例化。引用操作是通过类对象去调用类中的属性或者方法，而实例化是产生出一个类对象的实例，称作实例对象。
# class people:
#     name = 'jack'
#     age = 12
#     __name= 'xiaojack'#私有属性
#     __age = 11
#     def getName(self):
#         return self.__name
#     def getAge(self):
#         return self.__age
# p  = people()
# print(p.name,p.age)
# print(p.getAge(),p.getName())#访问私有属性的方法
# #私有属性的访问？
# # __new__():__new__()在__init__()之前被调用，
# # 用于生成实例对象。利用这个方法和类属性的特性可以实现
# # 设计模式中的单例模式。单例模式是指创建唯一对象吗，单例模
# # 式设计的类只能实例化一个对象
# # 单例模式？？？？
# class Singleton(object):
#     __instance = None
#     def __init__(self):
#         pass
#     def __new__(cls,*args,**kwg):
#         if Singleton.__instance is None:
#             Singleton.__instance = object.__new__(cls,*args,**kwg)
#         return Singleton.__instance
# class Fruit(object):
#     def __init__(self,color="red",price=0):
#         self.__color = color
#         self.__price = price
#     def __getattribute__(self, item):
#         return object.__getattribute__(self,item)
#     def __setattr__(self, key, value):
#         self.__dict__[key] = value
# if __name__ == "__main__":
#     fruit = Fruit("blue",10)
#     print(fruit.__dict__.get("_Fruit__color"))
#     fruit.__dict__["_Fruit__price"] = 5
#     print(fruit.__dict__.get("_Fruit__price"))
# class FruitShop:
#     def __getitem__(self, i):
#         return self.fruits[i]
# if __name__ == "__main__":
#     shop = FruitShop()
#     shop.fruits =["apple","banana"]
#     print(shop[1])
#     for item in shop:
#         print(item)
# #多个序列呢？
# class Fruit:
#     '''Fruit类'''
#     def __str__(self):
#         return self.__doc__
# if __name__ == "__main__":
#     fruit =Fruit()
#     print(str(fruit))
#     print(fruit)
# # __call__():在类中实现__call__()方法，可以在对象创建时直接返回__call__()的内容。使用该方法可以模拟静态方法。代码例子
# class Fruit:
#     class Growth:
#         def __call__(self):
#             print("grow ...")
#     grow = Growth()
# if __name__ == '__main__':
#     fruit =Fruit()
#     fruit.grow()
#     fruit.grow()