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# skbio.tree.TreeNode.preorder

`TreeNode.``preorder`(include_self=True)

  Performs preorder iteration over tree

  State: Experimental as of 0.4.0.

  Parameters: | include_self (bool) – include the initial node if True
  Yields: | TreeNode – Traversed node.

  See also

  `traverse()`, `postorder()`, `pre_and_postorder()`, `levelorder()`, `tips()`, `non_tips()`

  Examples

      >>> from skbio import TreeNode
      >>> tree = TreeNode.read(["((a,b)c);"])
      >>> for node in tree.preorder():
      ...     print(node.name)
      None
      c
      a
      b