install module in python 3 linux code example

Example 1: python3 pip install

[server]$  python3 -m pip install

Example 2: pip install python 3

You cannot just pip install python3 because it is not a library.

If you want to install the latest python3:
https://www.python.org/ftp/python/3.8.2/python-3.8.2.exe