如何在python中将nltk树(Stanford)转换为newick格式？

pip install nltk
pip install stanford-parser

import nltk
from nltk.tree import Tree

nltk.download('stanford-parser')
nltk.download('stanford-parser-3.9.2-models')

def nltk_tree_to_newick(tree):
    if isinstance(tree, Tree):
        return "(" + " ".join([nltk_tree_to_newick(child) for child in tree]) + ")"
    else:
        return tree

from nltk.parse.stanford import StanfordParser

stanford_parser_dir = 'path/to/stanford-parser.jar'
stanford_model_dir = 'path/to/stanford-parser-3.9.2-models.jar'

parser = StanfordParser(
    path_to_jar=stanford_parser_dir,
    path_to_models_jar=stanford_model_dir
)

text = "Your input text"
parsed_trees = parser.raw_parse(text)

for parsed_tree in parsed_trees:
    nltk_tree = next(parsed_tree)
    newick_tree = nltk_tree_to_newick(nltk_tree)
    print(newick_tree)