提问人：n0te 提问时间：8/5/2023 更新时间：8/6/2023 访问量：35
IndexError：列表赋值索引超出范围，删除
IndexError: list assignment index out of range, deletion
问：
我正在尝试制作一个程序，该程序循环遍历列表并删除列表其余部分具有相似标题的项目。headlines
# Loop through headlines and remove over 50% similar ones
headlines = listHeadlines()
# headlines.append('Our plan is working says Hunt, as Bank raises interest rate to 5.25%')
print(len(headlines), headlines)
headlines_copy = list(headlines)
for headline in headlines_copy:
for h in headlines_copy:
if h == headline:
pass
elif areStringsSimilar(h, headline):
del headlines[headlines_copy.index(headline)]
break # Exit this loop and move back to other because headline has been deleted from list.
print(len(headlines), headlines)
第一个工作并打印，但随后出现错误：print(len(headlines), headlines)1248 [list]
Traceback (most recent call last):
File "/Users/[path]/main.py", line 95, in <module>
del headlines[headlines_copy.index(headline)]
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
IndexError: list assignment index out of range
Process finished with exit code 1
答：
0赞
Bill Lynch
8/6/2023
#1
https://docs.python.org/3/tutorial/datastructures.html#more-on-lists
list.remove(x)从列表中删除其值等于 x 的第一项。如果没有此类项，则引发 ValueError。
所以与其说，不如做.del headlines[headlines_copy.index(headline)]headlines.remove(headline)
0赞
sahasrara62
8/6/2023
#2
index = 0
headlines = listHeadlines()
print(len(headlines), headlines)
while index < len(headlines):
for i, h in enumerate(headlines):
if i == index:
pass
elif areStringsSimilar(h, headline):
del headlines[i]
index -= 1
break
else:
index += 1
print(len(headlines), headlines)
0赞
Luatic
8/6/2023
#3
为什么不附加你想保留的标题，而不是删除你不想要的标题：
headlines = listHeadlines()
deduplicated = []
for candidate in headlines:
if not any(map(lambda kept: areStringsSimilar(candidate, kept), deduplicated)):
deduplicated.append(candidate)
print(deduplicated)
评论
0赞
n0te
8/6/2023
谢谢。我不想将标题附加到新列表中，因为我不知道如何在使用嵌套循环时多次附加相同的标题。您的解决方案似乎避免了这种情况，所以谢谢。
评论
list(set(headlines))["a", "b", "c"]areStringsSimilar("a", "b") == true["a","c"]["b", "c"]["c"]areStringsSimilar()