Homebrew Python Updates

[admtthomas]

brew install python python@2

pip  install --upgrade pip setuptools neovim

pip3 install --upgrade pip setuptools wheel neovim ipython simplejson requests boto

Other issues: brew doctor greenlet header files

[todd-dsm]

fixed; testing

[todd-dsm]

minimized python2; re-installed most libs with pip3:

$ pip list
Package    Version
---------- -------
futures    3.2.0  
greenlet   0.4.15 
msgpack    0.5.6  
neovim     0.2.6  
pip        18.0   
setuptools 40.2.0 
six        1.11.0 
trollius   2.2    
wheel      0.31.1 

$ pip3 list
Package           Version
----------------- -------
ansible           2.6.4  
asn1crypto        0.24.0 
awscli            1.16.10
bcrypt            3.1.4  
boto              2.49.0 
botocore          1.12.0 
cffi              1.11.5 
colorama          0.3.9  
cryptography      2.3.1  
docutils          0.14   
idna              2.7    
Jinja2            2.10   
jmespath          0.9.3  
jmespath-terminal 0.2.1  
MarkupSafe        1.0    
paramiko          2.4.1  
pip               18.0   
pyasn1            0.4.4  
pycparser         2.18   
Pygments          2.2.0  
PyNaCl            1.2.1  
python-dateutil   2.7.3  
PyYAML            3.13   
rsa               3.4.2  
s3transfer        0.1.13 
setuptools        40.2.0 
six               1.11.0 
urllib3           1.23   
urwid             1.2.2  
wheel             0.31.1