ImportError: cannot import name _remove_dead_weakref

https://askubuntu.com/questions/981663/python2-7-broken-by-weakref-import-error-please-help

Output of "python --version" is

Python 2.7.12

however "update python" produces:

python is already the newest version (2.7.14-2ubuntu1).

意思是通过

conda update python

跟新一下python就行了！