negation_detection.py 文件源码

def getLeaves(ptree):
    import nltk
    rs = []
    if isinstance(ptree, nltk.tree.ParentedTree):
        if len(ptree)>0:
            if  isinstance(ptree[0], unicode):
                rs.append(ptree)
    for node in ptree:
        if isinstance(node, nltk.tree.ParentedTree):
            if len(node)>0:
                if  isinstance(node[0], unicode):
                    rs.append(node)
                else:
                    rs.extend(getLeaves(node))
    return rs