Gilbert Wilson added the comment:
Well what do you know, it does indeed look like a pip3 upgrade issue! I'll
wander over to the pip issue tracker and file a bug/upvote over there. Thanks!
gilw-mbp:bin gilw$ ls -al pip*
-rwxrwxr-x 1 root admin 253 Apr 17 09:21 pip3
-rwxrwxr-x 1
New submission from Gilbert Wilson :
The python-3.6.5-macosx10.6.pkg installs pip3 as pip. This means if you have
both python2.7.x and 3.6.x you get unexpected and undesirable behavior.
According to the release notes in 3.6.5:
Python 3 and Python 2 Co-existence
Python.org Python 3.6 and 2.7
