_collections.py 文件源码

def _manage_size(self):
        if not self._mutex.acquire(False):
            return
        try:
            while len(self) > self.capacity + self.capacity * self.threshold:
                by_counter = sorted(dict.values(self),
                                    key=operator.itemgetter(2),
                                    reverse=True)
                for item in by_counter[self.capacity:]:
                    try:
                        del self[item[0]]
                    except KeyError:
                        # deleted elsewhere; skip
                        continue
        finally:
            self._mutex.release()