Home / Questions / 192012
Accepted
Revolucion for Monica
Asked: 2020-08-28 17:27:37 +0800 CST 2020-08-28 17:27:37 +0800 CST

How to get the first item in a list?

  • 772

I have an array ( list) of words that represents a tree created by SpaCy and I would like to get the first element start_VB_ROOTbut I don't get it.

>>>questionSpacy = spacy_nlp(question)
>>>treeQuestion = nltk_spacy_tree(questionSpacy)
>>>print(treeQuestion)
[Tree('start_VB_ROOT', ['When_WRB_advmod', 'did_VBD_aux', 'Beyonce_NNP_nsubj', Tree('becoming_VBG_xcomp', ['popular_JJ_acomp']), '?_._punct'])]

Indeed when it did treeQuestion[0]I get :

(start_VB_ROOT
  When_WRB_advmod
  did_VBD_aux
  Beyonce_NNP_nsubj
  (becoming_VBG_xcomp popular_JJ_acomp)

We want start_VB_ROOTbut when did treeQuestion[0][0]I getWhen_WRB_advmod

And when it did print(treeQuestion[0].label)I get:

 <bound method Tree.label of Tree('start_VB_ROOT', ['When_WRB_advmod', 'did_VBD_aux', 'Beyonce_NNP_nsubj', Tree('becoming_VBG_xcomp', ['popular_JJ_acomp']), '?_._punct'])>

So if I want to access element 1, I'm on IndexError

python

1 Answers

  1. Best Answer

    I assume that the elements are instances of nltk.Tree, so if you want to access the node label you must use the method Tree.label():

    >>> from nltk import Tree
>>> treeQuestion = [Tree('start_VB_ROOT', ['When_WRB_advmod', 'did_VBD_aux','Beyonce_NNP_nsubj', Tree('becoming_VBG_xcomp', ['popular_JJ_acomp']), '?_._punct'])]
>>> treeQuestion[0].label()
'start_VB_ROOT'
    • 0