Lines Matching refs:_root
120 self._root = None
132 _clear(self._root)
134 self._root = None
144 return self._root
153 if self._root is None:
154 self._root = self._new_node(key, value)
160 node = self._root
201 self._root = node_stack[0]
214 if self._root is None:
220 node = self._root
246 self._root = node[direction]
301 self._root = node_stack[0]
