AttributeError: 'NoneType' object has no attribute 'loader'

创建日期：2020.03.03
修改日期：2020.03.04

1、问题导引

（1）在Jupyter里面运行下面代码报错，是因为没有安装gensim。

from gensim import corpora, models, similarities
import gensim

（2）在Anaconda Prompt中安装gensim包

conda install -c conda-forge gensim

（3）然而出现问题

DEBUG menuinst_win32:create(320): Shortcut cmd is %windir%\System32\WindowsPowerShell\v1.0\powershell.exe, args are ['-ExecutionPolicy', 'ByPass', '-NoExit', '-Command', '"& \'C:\\ProgramData\\Anaconda3\\shell\\condabin\\conda-hook.ps1\' ; conda activate \'C:\\ProgramData\\Anaconda3\' "']
done
Error processing line 1 of C:\ProgramData\Anaconda3\lib\site-packages\matplotlib-3.1.0-py3.6-nspkg.pth:

  Traceback (most recent call last):
    File "C:\ProgramData\Anaconda3\lib\site.py", line 168, in addpackage
      exec(line)
    File "", line 1, in <module>
    File "", line 568, in module_from_spec
  AttributeError: 'NoneType' object has no attribute 'loader'

Remainder of file ignored

2、解决办法

这个错误是有关matplotlib-3.1.0的。在jupyter再次运行下面的代码，就没再报错。说明gensim安装成功了。

from gensim import corpora, models, similarities
import gensim

我关闭Anaconda Prompt后，再次重启。还是出现该错误。

Error processing line 1 of C:\ProgramData\Anaconda3\lib\site-packages\matplotlib-3.1.0-py3.6-nspkg.pth:

  Traceback (most recent call last):
    File "C:\ProgramData\Anaconda3\lib\site.py", line 168, in addpackage
      exec(line)
    File "", line 1, in <module>
    File "", line 568, in module_from_spec
  AttributeError: 'NoneType' object has no attribute 'loader'

经过参考别人连接，做了如下操作
在C:\ProgramData\Anaconda3\Lib\site-packages目录下，把matplotlib-3.1.0-py3.6-nspkg.pth删掉。上述错误不再显示。
我matplotlib-3.1.0-py3.6-nspkg.pth改成matplotlib-3.1.0-py3.6-nspkg.pth(ba-20200304)，做个备份。

为什么这样，我不晓得。有人知道的话，请给我留言。谢谢！

3、参考连接

CSDN：【兼容调试】AttributeError: ‘NoneType’ object has no attribute ‘loader’

stackoverflow： AttributeError: ‘NoneType’ object has no attribute ‘loader’