Install python from source (debian)

install-python.sh

# Reference: https://linuxize.com/post/how-to-install-python-3-9-on-debian-10/

PYVER=3.9.1

# Install the dependencies necessary to build Python:
sudo apt update
sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libsqlite3-dev libreadline-dev libffi-dev curl libbz2-dev liblzma-dev

wget https://www.python.org/ftp/python/${PYVER}/Python-{PYVER}.tgz
tar -xf Python-${PYVER}.tgz

cd Python-${PYVER}
./configure --enable-optimizations

make -j $(nproc)

sudo make altinstall