Nltk: 您的 https://raw.githubusercontent.com/nltk/nltk_data/gh-pages/index.xml 有问题

在 xml 在线验证器中告诉：

An error has been found! 
Click on  to jump to the error. In the document, you can point at  with your mouse to see the error message. 
Errors in file xml-schema: 
    23: 144 Attribute name "unzipped_size" associated with an element type "package" must be followed by the ' = ' character.

当我尝试在 python3 中下载stopwords

import nltk
nltk.download('stopwords')

出现错误

>>> import nltk
>>> nltk.download('stopwords')

Traceback (most recent call last):
  File "/usr/lib/python3.5/code.py", line 91, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "/usr/local/lib/python3.5/dist-packages/nltk/downloader.py", line 664, in download
    for msg in self.incr_download(info_or_id, download_dir, force):
  File "/usr/local/lib/python3.5/dist-packages/nltk/downloader.py", line 534, in incr_download
    try: info = self._info_or_id(info_or_id)
  File "/usr/local/lib/python3.5/dist-packages/nltk/downloader.py", line 508, in _info_or_id
    return self.info(info_or_id)
  File "/usr/local/lib/python3.5/dist-packages/nltk/downloader.py", line 875, in info
    self._update_index()
  File "/usr/local/lib/python3.5/dist-packages/nltk/downloader.py", line 825, in _update_index
    ElementTree.parse(compat.urlopen(self._url)).getroot())
  File "/usr/lib/python3.5/xml/etree/ElementTree.py", line 1184, in parse
    tree.parse(source, parser)
  File "/usr/lib/python3.5/xml/etree/ElementTree.py", line 596, in parse
    self._root = parser._parse_whole(source)
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 23, column 143

在你的xml
<package checksum="6f9c042774b96366c93fd0f9a9adb697" id="dolch" name="Dolch Word List" size="2116" subdir="corpora" unzip="1" unzipped_size"1917" url="https://en.wikipedia.org/wiki/Dolch_word_list" />

unzipped_size"1917"必须是 unzipped_size="1917"
缺少等号