switching versions of python code example

Example 1: switching versions of python

# Check your python version 
python --version
Python 3.9.0 
# Check the python installation list 
pyenv install --list 
[Whole list available for you, pick yours]
pyenv install 3.9.1
pyenv global 3.9.1 
python --version 
Python 3.9.1

Example 2: transition from python 2 to 3 terminal

alias python="python3"