git clone https://github.com/python/cpython
git checkout <version>
./configure --enable-optimizations
make -j8
sudo make altinstall
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.9 2 sudo update-alternatives --config python3
sudo apt install virtualenvwrapper
sudo find / -name "virtualenvwrapper.sh"
mkvirtualenv -p python<version> <name>
workon <name>
deacative
rmvirtualenv <name>