python - 使用while循环python查找下一个元素
问题描述
我坚持这个想法。我想打印紧跟在代词名词之后的动词,所以我正在迭代,直到循环找到一个动词。然后打印它。但它似乎不仅打印了动词,还打印了其他元素。知道我会出错吗?太感谢了
points = [('I', 'PRON', 'nsubj'),
('don', 'AUX', 'aux'),
('t', 'PART', 'neg'),
('hope', 'VERB', 'ROOT'),
('that', 'SCONJ', 'mark'),
('the', 'DET', 'det'),
('salary', 'NOUN', 'nsubj'),
('will', 'AUX', 'aux'),
('change', 'VERB', 'ccomp'),
('.', 'PUNCT', 'punct')]
for i, (word, pos, dep) in enumerate(points):
intermediate_list_sentences = []
if pos == "PRON" or pos == "NOUN":
iterate = 1
while points[i+iterate][1] != "VERB":
iterate+=1
print(points[i+iterate][0])
期望的输出 => 希望
解决方案
要修复您的代码,您只需要在跳过所有非动词print
词之后print
使用该词,而不是非动词词本身,即移出循环:
while points[i+iterate][1] != "VERB":
iterate+=1
print(points[i+iterate][0])
iter
或者,您可以从单词列表中创建一个并使用两个嵌套for
循环迭代相同的迭代器:
it = iter(points)
for word, pos, dep in it:
if pos in ("PRON", "NOUN"):
print(word)
for word2, pos2, _ in it:
if pos2 == "VERB":
print(word2)
break
或更简洁,next
用于获取匹配项VERB
:
it = iter(points)
for word, pos, dep in it:
if pos in ("PRON", "NOUN"):
verb = next((word2 for word2, pos2, _ in it if pos2 == "VERB"), None)
print(word, verb)
输出:
I hope
salary change