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# skbio.tree.TreeNode.unpack

`TreeNode.``unpack`()

  Unpack an internal node in place.

  State: Experimental as of 0.5.3.

  Notes

  This function sequentially: 1) elongates child nodes by branch length of self (omit if there is no branch length), 2) removes self from parent node, and 3) grafts child nodes to parent node.

  Raises: | `ValueError` – if input node is root or tip

  See also

  `unpack_by_func()`, `prune()`

  Examples

      >>> from skbio import TreeNode
      >>> tree = TreeNode.read(['((c:2.0,d:3.0)a:1.0,(e:2.0,f:1.0)b:2.0);'])
      >>> tree.find('b').unpack()
      >>> print(tree)
      ((c:2.0,d:3.0)a:1.0,e:4.0,f:3.0);
      <BLANKLINE>