Answers for "update python from 2.7 to 3.6"

update python ubuntu

sudo apt-get update && sudo apt-get upgrade
sudo apt-get install python3.7

update python ubuntu

$ sudo apt update -y
$ sudo apt install python3.7

update python 3.9

go to python.org website and download the latest python version
https://www.python.org/downloads/

change python from 3.8 to 3.7

conda create -n [env-name] python=3.7
#anaconda

update to python 3.7

Just go to their official website and download python 3.7:
  https://www.python.org/downloads/