为什么nltk word_tokenize即使执行nltk.download后也无法正常工作，并且所有软件包都已正确安装？

Question

我正在使用python 3.7 64位。 nltk版本3.4.5。

[当我尝试使用word_tokenize将nltk.book中的text6转换为标记时，出现错误。

import nltk
from nltk.tokenize import word_tokenize
from nltk.book import *
tokens=word_tokenize(text6)

代码在空闲3.7中完成

下面是我执行最后一条语句时的错误。

    Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    tokens=word_tokenize(text6)
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\__init__.py", line 144, in word_tokenize
    sentences = [text] if preserve_line else sent_tokenize(text, language)
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\__init__.py", line 106, in sent_tokenize
    return tokenizer.tokenize(text)
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 1277, in tokenize
    return list(self.sentences_from_text(text, realign_boundaries))
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 1331, in sentences_from_text
    return [text[s:e] for s, e in self.span_tokenize(text, realign_boundaries)]
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 1331, in <listcomp>
    return [text[s:e] for s, e in self.span_tokenize(text, realign_boundaries)]
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 1321, in span_tokenize
    for sl in slices:
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 1362, in _realign_boundaries
    for sl1, sl2 in _pair_iter(slices):
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 318, in _pair_iter
    prev = next(it)
  File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\tokenize\punkt.py", line 1335, in _slices_from_text
    for match in self._lang_vars.period_context_re().finditer(text):
TypeError: expected string or bytes-like object

请帮助。预先感谢。

Answer 1

pip3安装nltk

pip / pip3仅在有多个python时才无关紧要，但是如果那不起作用（找不到命令），请输入：

py -3 -m pip install nltk