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Please help me. i have try out alot of way to get install, upgrade my python3.7 to python3.9 yet it keep shows up error.

sudo apt-get install python3 (Python3 is already the newest version [3.7.3-1])

sudo apt-get upgrade python3 (Python3 is already the newest version [3.7.3-1])

sudo add-apt-repository ppa:deadsnakes/ppa (file "/user/bin/add-apt-repository", line 95, in ) (sp = SoftwareProperties(options=options) (....) (Error: could not find a distribution template for Raspbian/buster)

sudo apt-get install build-essential python-dev libsqlite3-dev libreadline6-dev libgdbm-dev zlib1g-dev libbz2-dev sqlite3 zip (after install 2 newly package) sudo apt-get install python3 python3-dev (still back to python3.7)

anyone know how to make it to python3.9?

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you have to type this in terminal:

sudo apt install python3.9

but you never can upgrade your Linux python to a newer version. It is internal. but you can install python3.9 and use virtualenv to use your code in python3.9

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Thanks alot, i able to install and use it for python 3.9
@GermaineOng Please mark the answer as answer so that It will be helpful for others too.
pi@octopi:~ $ sudo apt install python3.9 Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package python3.9 E: Couldn't find any package by glob 'python3.9' E: Couldn't find any package by regex 'python3.9'

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