python - Change value of leaf in NLTK -


i want change value of leaf in parsed tree object in nltk. use following code.

t = tree(line) chomsky_normal_form(t, horzmarkov=2, vertmarkov=1, childchar = "|", parentchar = "^") print t  leaf in t.leaves():     if leaf==k[0][1]:         leaf = "newvalue"  print t

as 2 'print t' gives exact same output of tree. thought possible set value leaf in way seems wrong. how should update value of leaf? class of each leaf str. possible change them doesn't seem update update object in tree.

you use treepositions('leaves') (docs) position of leaves in tree , change directly in tree.

t = tree(line) chomsky_normal_form(t, horzmarkov=2, vertmarkov=1, childchar = "|", parentchar = "^")  leafpos in t.treepositions('leaves'):     if t[leafpos] == k[0][1]:         t[leafpos] = "newvalue"  print t

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