How to install Python 3.9 & pip 3 on Linux (Ubuntu 20.04, 20.10, and its derivatives)

Commands:
$ sudo add-apt-repository ppa:deadsnakes/ppa
$ sudo apt update
$ sudo apt install python3.9

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[fluffygod]

I have python 2.17.6, I want to get the latest version, How do I do this?

[muhammadreza]

can i update python 3.8 to 3.9 instead of making another python3.9?