Treebank-style Tree Parser Python

Recently i have been trying to parse syntactic trees returned by the stanford parser in python. I have been trying to do that with nltk tree = Tree.parse(result['sentences'][0]['pa

Solution 1:

Unfortunately, PyInputTree is no longer maintained. However, the InputTree class from the Charniak parser lives on in wrapped form as the Tree class in BLLIP Parser. It doesn't implement isPrePreTerminal() but here's one way to do it:

import bllipparser

defis_prepreterminal(node):
    """Returns True iff all children of this node are preterminals."""
    subtrees = node.subtrees()
    returnlen(subtrees) > 0and \
        all(subtree.is_preterminal() for subtree in subtrees)

# testing code
tree = bllipparser.Tree('(S1 (S (NP (DT This)) (VP (VBZ is) (NP (DT a) (ADJP (RB fairly) (JJ simple)) (NN parse) (NN tree))) (. .)))')
for subtree in tree.all_subtrees():
    print subtree, is_prepreterminal(subtree)

See bllipparser on PyPI for more information.