sudo apt-get install python3
$ sudo apt-get install software-properties-common
$ sudo add-apt-repository ppa:deadsnakes/ppa
$ sudo apt-get update
$ sudo apt-get install python3.8
$ sudo add-apt-repository ppa:deadsnakes/ppa
$ sudo apt-get update
$ sudo apt install python3.9
In RHEL & CENTOS::
Step 1: Open a Terminal and add the repository to your Yum install.
sudo yum install -y https://repo.ius.io/ius-release-el7.rpm
Step 2: Update Yum to finish adding the repository.
sudo yum update
Step 3: Download and install Python.