Question

我试图运行我的程序，但遇到了一个错误：

    Traceback (most recent call last):
  File "C:\myquestions\questansgen-script.py", line 11, in <module>
    load_entry_point('questansgen==0.1', 'console_scripts', 'questansgen')()
  File "c:\Python36\lib\site-packages\click\core.py", line 610, in __call__
    return self.main(*args, **kwargs)
  File "c:\Python36\lib\site-packages\click\core.py", line 590, in main
    rv = self.invoke(ctx)
  File "c:\Python36\lib\site-packages\click\core.py", line 782, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\Python36\lib\site-packages\click\core.py", line 416, in invoke
    return callback(*args, **kwargs)
  File "C:\myquestions\questansgen\scripts\questansgen.py", line 22, in generate_trivia
    questions = questions + article.generate_trivia_sentences()
  File "C:\myquestions\questansgen\article.py", line 22, in generate_trivia_sentences
    trivia = self.evaluate_sentence(sentence)
  File "C:\myquestions\questansgen\article.py", line 100, in evaluate_sentence
    trivia['similar_words'] = self.get_similar_words(replace_nouns[0])
  File "C:\myquestions\questansgen\article.py", line 39, in get_similar_words
    hypernym = synset.hypernyms()[0]
IndexError: list index out of range

以下是我正在实施的代码，其中发生错误：
Code file

请告诉我，我可以做些什么来避免此错误，并输入任意数量的文字进行处理。

Answer 1

粗俗：try-except

def first_hypernym(ss):
    try:
        x = ss.hypernyms()[0]
    except IndexError:
        x = None
    return x

单行：if-else

first_hypernym = None if not ss.hypernyms() else ss.hypernyms()[0]

要证明这一点：

>>> x = []
>>> y = None if not x else x[0]
>>> y
>>>

请参阅Best way to check if a list is empty

以煞费苦心的启发式/语言学方式：看https://github.com/alvations/pywsd/blob/master/pywsd/allwords_wsd.py#L29（免责声明：无耻插件）

Python3：如何解决列表出界错误？

1 个答案: