code: def release_lock(self, force=False):
          
          if self.readonly:
              raise exc.ReadOnlyDatabase()
          if self._locked or force:
              self.log.debug("Removing lock file: {0}".format(self.lockfile))
              if os.path.exists(self.lockfile):
                  os.remove(self.lockfile)
                  self._locked = False
          else:
              self.log.debug("Database not locked (not removing)")
docs: Releases the lock  (deletes the <dbname>.lock file) if it was acquired by this class or force is set to True.
          
          :param force: Whether to force releasing the lock (e.g. if it was not acquired during this session).
          :type force: bool