title: functools has no attribute lru_cache
body: <p>I'm using Python 3.7 on my Windows</p>
  <p>This error occurs while running every code:</p>
  <pre><code>Traceback (most recent call last):
    File &quot;test.py&quot;, line 1, in &lt;module&gt;
      import nltk
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\__init__.py&quot;, line 99, in &lt;module&gt;
      from nltk.internals import config_java
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\site-packages\nltk\internals.py&quot;, line 11, in &lt;module&gt;
      import subprocess
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\subprocess.py&quot;, line 50, in &lt;module&gt;
      import signal
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\signal.py&quot;, line 3, in &lt;module&gt;
      from functools import wraps as _wraps
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\functools.py&quot;, line 21, in &lt;module&gt;
      from collections import namedtuple
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\collections\__init__.py&quot;, line 22, in &lt;module&gt;
      from keyword import iskeyword as _iskeyword
    File &quot;C:\Users\HP\Desktop\tweepy\keyword.py&quot;, line 1, in &lt;module&gt;
      import re
    File &quot;C:\Users\HP\AppData\Local\Programs\Python\Python37\lib\re.py&quot;, line 297, in &lt;module&gt;
      @functools.lru_cache(_MAXCACHE)
  AttributeError: module 'functools' has no attribute 'lru_cache'
  </code></pre>
  <p>How to fix it?</p>