Method decrement

xarray/backends/file_manager.py:313–320

(self, name)

        return count

    def decrement(self, name):
        with self._lock:
            count = self._counts[name] - 1
            if count:
                self._counts[name] = count
            else:
                del self._counts[name]
        return count


class _HashedSequence(list):