i have python 2.7.15 and python 3.6.8 how can i use 3.6.8 code example

Example 1: python version

python ––version

Example 2: download python

Step 1: Download Python newest version from

 https://www.python.org/downloads/

Step 2:Install Python
Step 3:Download Pycharm Community free version
Step 4:Install and open Pycharm
Step 5:Write print("Hello New World")
  //Hurray you are about to start python