ImportError: cannot import name _remove_dead_weakref

[dieter]

Chris Angelico <rosuav at gmail.com> writes:
> ...
> Somewhere, you have a mismatch of versions. Make sure you're using the
> same Python version for everything. You have some Python 2.7 messing
> up your 3.5.

I have had similar problems. In my case, an active "PYTHONPATH" envvar
was responsible -- "unset"ting this envar has resolved the problem for me.