如何通过nltk python中的标签获取树中的节点? [英] How to get a node in a tree by its label in nltk python?

问题描述

我有一棵树:

(S  
    (WH-QUERY Which)  
    (FLIGHT-NP   
        (FLIGHT-CNP  
            (FLIGHT-CNP (FLIGHT-N flight))  
            (FLIGHT-DEST to (CITY-NP (CITY-NAME Hue) (CITY-N city)))))  
    (FLIGHT-VP  
        (FLIGHT-V arrives)  
        (FLIGHT-TIME (P-TIME at) (TIME-MOD 20:00HR))))  

我想通过nltk中的标签获取特定的节点.例如，我具有标签"CITY-NAME"，并且我想要获取节点(CITY-NAM Hue).我该如何实现?

I want to get a specific node by its label in nltk. For example, I have label "CITY-NAME", and I want to get the node (CITY-NAM Hue). How can I achieve this?

推荐答案

一种方法是遍历树搜索匹配的节点:

One way to do it is to walk the tree searching for nodes that match:

for subtree in tree.subtrees():
     if subtree.label() == 'CITY-NAME':
          print subtree.leaves()

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