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

I had a similar error with my virtual environments on a mac, but referring to matplotlib:

Error processing line 1 of //anaconda3/lib/python3.7/site-packages/matplotlib-3.1.3-py3.7-nspkg.pth:

As in the previous answer, it was solved by changing the file mentioned:

import sys, types, os;has_mfs = sys.version_info > (3, 5);p = os.path.join(sys._getframe(1).$

to this, via a linebreak:

import sys, types, os;
has_mfs = sys.version_info > (3, 5);p = os.path.join(sys._getframe(1).$

I had the similar problem, but the error message referenced a different .pth file. The error message I received was:

Error processing line 1 of /Users/jt/anaconda3/lib/python3.7/site-packages/sphinxcontrib.datatemplates-nspkg.pth:

  Traceback (most recent call last):
    File "/Users/jt/anaconda3/lib/python3.7/site.py", line 168, in addpackage
      exec(line)
    File "<string>", line 1, in <module>
    File "<frozen importlib._bootstrap>", line 580, in module_from_spec
  AttributeError: 'NoneType' object has no attribute 'loader'

Remainder of file ignored

Following the solution described here:

https://github.com/Pyomo/pyomo/issues/95

I edited the .pth file (the file at the start of the error message, immediately after the text Error processing line 1 of) and added a newline character after the first semicolon. That is, I changed:

import sys, types, os;has_mfs = sys.version_info > (3, 5);p ...<rest of file>

To:

import sys, types, os;
has_mfs = sys.version_info > (3, 5);p ...<rest of file>

I don't know why this worked, but it did.

Delete /home/cjones/.local/lib/python3.6/site-packages/googleapis_common_protos-1.5.8-py3.6-nspkg.pth and retry.