#!/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()