Best software for creating charts????

[snippsat]

I guess you use Windows.
Matplotlib has C dependencies,so you use wheel from Gohlke.
There are minimum Requires: numpy, dateutil, pytz, pyparsing, cycler, setuptools.

All installasjon is done with pip.
pip should be installed when you did install Python 3.6.
Start cmd and post back what pip -V return.
Eg:

C:\WINDOWS\system32>cd\
C:\>pip -V
pip 9.0.1 from c:\python36\lib\site-packages (python 3.6)

C:\>