title: Python Eclipse PyDev
body: <p>I am a complete newbie to Python.
  I have downloaded and installed Anaconda 3.5.2 on Windows 7, then Eclipse Photon. Installed the PyDev Plugin.
  I was able to run a few simple test programs in Eclipse.</p>
  
  <p>Suddenly, without installing anything I get</p>
  
  <pre><code>Error processing line 1 of C:\Anaconda3\lib\site-packages\matplotlib-2.2.2-py3.6-nspkg.pth:
  
  Failed to import the site module
  Traceback (most recent call last):
    File "C:\Anaconda3\lib\site.py", line 168, in addpackage
      exec(line)
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "C:\Anaconda3\lib\types.py", line 171, in &lt;module&gt;
      import functools as _functools
    File "C:\Anaconda3\lib\functools.py", line 21, in &lt;module&gt;
      from collections import namedtuple
  ImportError: cannot import name 'namedtuple'
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "C:\Anaconda3\lib\site.py", line 541, in &lt;module&gt;
      main()
    File "C:\Anaconda3\lib\site.py", line 523, in main
      known_paths = addsitepackages(known_paths)
    File "C:\Anaconda3\lib\site.py", line 320, in addsitepackages
      addsitedir(sitedir, known_paths)
    File "C:\Anaconda3\lib\site.py", line 207, in addsitedir
      addpackage(sitedir, name, known_paths)
    File "C:\Anaconda3\lib\site.py", line 178, in addpackage
      import traceback
    File "C:\Anaconda3\lib\traceback.py", line 5, in &lt;module&gt;
      import linecache
    File "C:\Anaconda3\lib\linecache.py", line 8, in &lt;module&gt;
      import functools
    File "C:\Anaconda3\lib\functools.py", line 21, in &lt;module&gt;
      from collections import namedtuple
  ImportError: cannot import name 'namedtuple'
  </code></pre>
  
  <p>even with a "Hello World" which ran before</p>
  
  <p>Any ideas what could cause this?</p>