Installing python3 packages using pip

[Rich Shepard]

The host has Python3-3.7.4 installed. Trying to use "pip install numpy3"
fails:

# pip install numpy3 
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020.
Please upgrade your Python as Python 2.7 won't be maintained after that
date. A future version of pip will drop support for Python 2.7. More details
about Python 2 support in pip, can be found at
https://pip.pypa.io/en/latest/development/release-process/#python-2-support

Collecting numpy3
   ERROR: Could not find a version that satisfies the requirement numpy3
(from versions: none) 
ERROR: No matching distribution found for numpy3

How do I install numpy3, python3-matplotlib, and scipy3 using PIP?

Rich