Comment 5 for bug 1812672

I understand your point regarding Python versions but still I don't see any incompatible changes and commenting that line should not make differences.

I noticed something strange in logs that you shared to use. The memcache module used is coming from a package called "dogpile" /usr/lib/python3/dist-packages/dogpile where it should normally come from /usr/lib/python3/dist-packages/memcache.py

Can you try to log in a Python prompt, import "memcache" and then print the version and path?

My thinking is that there is a package conflict.

You should have something like:

(.py3) ubuntu@bug1812672:~$ python
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import memcache
>>> memcache.__version__
'1.57'
>>> memcache.__file__
'/usr/lib/python3/dist-packages/memcache.py'

(.py2) ubuntu@bug1812672:~$ python
Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import memcache
>>> memcache.__version__
'1.57'
>>> memcache.__file__
'/usr/lib/python2.7/dist-packages/memcache.pyc'