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#!/usr/bin/env python

# -*- encoding: utf-8 -*-

"""

Topic: sample

Desc : 包装对象简例

引用一个属性时，python解释器试着在局部名称空间中查找那个名字，

比如一个自定义的方法或局部实例属性，如果没有在局部字典中找到，

则搜索类名称空间，以防一个类属性被访问（Class属性，类似于静态变量）

如果两类搜索都失败了，搜索则对原对象开始授权请求，此时，__getattr__()被调用

注：属性可以是数据属性，还可以是函数或方法

"""

from time import time, ctime

__author__ = 'Xiong Neng'

class WrapMe(object):

def __init__(self, obj):

self.__data = obj

def get(self):

return self.__data

def __repr__(self):

return repr(self.__data)

def __str__(self):

return str(self.__data)

# 仅仅在属性找不到时调用

def __getattr__(self, item):

print('I call the __getattr__ method - '),

return getattr(self.__data, item)

# 无论何时都会调用

def __getattribute__(self, item):

print('I call the __getattribute__ method - '),

return super(WrapMe, self).__getattribute__(item)

def mymethod(self):

print('hahaha')

wr = WrapMe(3.5 + 4.2j)

print(wr)

print(wr.real)

print(wr.imag)

ee = wr.get

wr.mymethod()

class TimeWrapMe(object):

def __init__(self, obj):

self.__data = obj

self.__ctime = self.__mtime = self.__atime = time()

def get(self):

return self.__data

def getTimeVal(self, tType):

if not isinstance(tType, str) or tType[0] not in 'cma':

raise (TypeError, "argument 'c', 'm', 'a'")

return getattr(self, '_%s__%stime' %

(self.__class__.__name__, tType[0]))

def getTimeStr(self, tType):

return ctime(self.getTimeVal(tType))

def set(self, obj):

self.__data = obj

self.__mtime = self.__atime = time()

def __repr__(self):

self.__atime = time()

return repr(self.__data)

def __str__(self):

self.__atime = time()

return str(self.__data)

def __getattr__(self, item): # delegate

self.__atime = time()

return getattr(self.__data, item)

class Haha(object):

pass

def main():

haha = Haha()

haha.name = 'name'

print(haha.__dict__)

print(Haha.__dict__)

if __name__ == '__main__':

main()

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