#we can use pyenv:

git clone https://github.com/pyenv/pyenv.git ~/.pyenv

echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc

echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc

echo 'eval "$(pyenv init -)"' >> ~/.bashrc

exec $SHELL -l

pyenv install 3.9.10 -v

pyenv rehash

pyenv global 3.9.10