在py3中使用nltk时出现“错误转义”

Question

NLTK版本3.4.5。Python 3.7.4。OSX版本10.14.5。

从2.7升级代码库，刚开始遇到此问题。我已经在全新的virtualenv中完成了所有软件包和扩展的全新无缓存重新安装。关于这怎么可能只发生在我身上，我很迷惑，我找不到其他在线遇到相同错误的人。

(venv3) gmoss$ python
Python 3.7.4 (default, Sep  7 2019, 18:27:02) 
[Clang 10.0.1 (clang-1001.0.46.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import nltk
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/site-packages/nltk/__init__.py", line 150, in <module>
    from nltk.translate import *
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/site-packages/nltk/translate/__init__.py", line 23, in <module>
    from nltk.translate.meteor_score import meteor_score as meteor
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/site-packages/nltk/translate/meteor_score.py", line 10, in <module>
    from nltk.stem.porter import PorterStemmer
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/site-packages/nltk/stem/__init__.py", line 29, in <module>
    from nltk.stem.snowball import SnowballStemmer
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/site-packages/nltk/stem/snowball.py", line 314, in <module>
    class ArabicStemmer(_StandardStemmer):
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/site-packages/nltk/stem/snowball.py", line 326, in ArabicStemmer
    r'[\u064b-\u064c-\u064d-\u064e-\u064f-\u0650-\u0651-\u0652]'
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/re.py", line 234, in compile
    return _compile(pattern, flags)
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/re.py", line 286, in _compile
    p = sre_compile.compile(pattern, flags)
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/sre_compile.py", line 764, in compile
    p = sre_parse.parse(p, flags)
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/sre_parse.py", line 930, in parse
    p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, 0)
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/sre_parse.py", line 426, in _parse_sub
    not nested and not items))
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/sre_parse.py", line 536, in _parse
    code1 = _class_escape(source, this)
  File "/Users/gmoss/Documents/constructor/autocomplete/venv3/lib/python3.7/sre_parse.py", line 337, in _class_escape
    raise source.error('bad escape %s' % escape, len(escape))
re.error: bad escape \u at position 1

Answer 1

后续，这是一个误报：错误的清理脚本正在删除我的虚拟环境中的 NLTK 共享对象文件，我猜它正在回退到其他版本。