Lop off tips until the tree just has the desired tip names.
Parameters: | names : Iterable of str
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Returns: | TreeNode
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Raises: | ValueError
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See also
Examples
>>> from skbio.core.tree import TreeNode
>>> t = TreeNode.from_newick('((H:1,G:1):2,(R:0.5,M:0.7):3);')
>>> sheared = t.shear(['G', 'M'])
>>> print sheared.to_newick(with_distances=True)
(G:3.0,M:3.7);