def __init__(self, qpart):
        self._qpart = qpart

        self.width = self._DEFAULT_INDENT_WIDTH
        self.useTabs = self._DEFAULT_INDENT_USE_TABS

        self._smartIndenter = _getSmartIndenter('normal', self._qpart, self)
def dfs_print(root):
        if root is None:
            return
        dfs_print(root.left)
        print(str(root.key) + ' ', end='')
        dfs_print(root.right)