使用Spacy的标记化-如何获得左侧和右侧的标记

import spacy

nlp = spacy.load('en_core_web_sm')

text = "使用Spacy的标记化-如何获得左侧和右侧的标记"
doc = nlp(text)

target_token = "标记化"
target_token_index = None

for i, token in enumerate(doc):
    if token.text == target_token:
        target_token_index = i
        break

left_tokens = [token.text for token in doc[:target_token_index]]
right_tokens = [token.text for token in doc[target_token_index+1:]]