install python 3.7 pip code example
Example 1: install pip3 for python 3.7
sudo apt install python3-pip
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