Pyton Programming Please help me describe the following code: a) The structure b) The overall feature it might provide c) The mechanisms used to provide the feature. class Config(object): validKeys = [ 'CompanyName', 'ExternalName', 'Hostname', 'Domain', 'SambaDomain' ] def __init__(self): profileLocator = open(os.path.join(Settings.BaseDir, 'currentProfile')) profileName = profileLocator.read().replace(' ', '').strip() self.configFile = os.path.join(Settings.BaseDir, 'profiles', profileName) self.cache = {} self.cacheAge = 0 self.maxAge = 300 def __getattr__(self, name): if name in self.validKeys: configAge = os.stat(self.configFile).st_mtime now = time.time() #Setup conditions stillValid = self.cacheAge == configAge tooOld = (now self. cacheAge) > self.maxAge if self.cache and stillValid and not tooOld: return self.cache[name] # Read the file (full unbuffered) cfo = open(self.configFile, 'rt') self.cacheAge = os.stat(self.configFile).st_mtime data = cfo.read() cfo.close() d = {} exec data in d self.cache = d return self.cache[name] else: object.__getattr__(self, name, value)