在web.py, bottle这些微型框架中, 缓存数据这块是没有的, 但是又不想安装插件, 那就只有自己实现了

下面的是类似一个全局变量, 可以把数据保存在单例对象中

# coding: utf-8import timeclass SimpleCache(dict):    '''        cache = SimpleCache.getInstance()        cache.get('key')        cache.set('key', 'value')    '''    def __new__(cls, *args):        if not hasattr(cls, '_instance'):            cls._instance = dict.__new__(cls)        else:            raise Exception('SimpleCache already initialized')        return cls._instance    @classmethod    def getInstance(cls):        if not hasattr(cls, '_instance'):            cls._instance = dict.__new__(cls)        return cls._instance    def get(self, name, default=None):        if not name: return default        levels = name.split('.')        data = self        for level in levels:            try:                data = data[level]            except:                return default        return data    def set(self, name, value):        levels = name.split('.')        arr = self                for name in levels[:-1]:            if not arr.has_key(name):                arr[name] = {}            arr = arr[name]        arr[levels[-1]] = value    def getset(self, name, value):        g = self.get(name)        if not g:            g = value            self.set(name, g)        return g