rorpiter.py 文件源码

def next(self):
        """Return next elem, add to cache.  StopIteration passed upwards"""
        next_elem = self.iter.next()
        next_index = next_elem.index
        self.cache_dict[next_index] = next_elem
        self.cache_indicies.append(next_index)

        if len(self.cache_indicies) > self.cache_size:
            try:
                del self.cache_dict[self.cache_indicies[0]]
            except KeyError:
                log.Log("Warning: index %s missing from iterator cache" %
                    (self.cache_indicies[0],), 2)
            del self.cache_indicies[0]

        return next_elem