import nltk
from nltk.corpus import treebank
t = treebank.parsed_sents('wsj_0001.mrg')[0]
print t

print t.label()

print t[0]

print t[1]

print t[2]

print t[0][0]
print t[0][0][1]
print t[0][0][1][0]

print t.treepositions(order='preorder')

print t.leaves()

print t.flatten() # A tree with only the root and the leaves directly connected to it

for subtree in t.subtrees(): # Generate all subtrees
    print subtree

def filt(x):
    return x.label()=='NP'

for subtree in t.subtrees(filter =  filt): # Generate all subtrees
    print subtree

for subtree in t.subtrees(filter = lambda st: st.label()=='NN'):
    print subtree

t.pos()

import pln_inco.syntax_trees
import pln_inco.graphviz as gv
from IPython.display import Image
from IPython.display import display
from IPython.display import display_png

tree_dot=pln_inco.syntax_trees.tree_to_dot(t)

tree_png=Image(data=gv.generate(tree_dot,format='png'),width=1000)
display_png(tree_png)

print t.leaf_treeposition(10) #Note that leaves are numbered starting from 0!

print t.treeposition_spanning_leaves(8,14)

print t[1][1]