Installing python3.6.5 on debain9.4

install_python36_on_deb.txt

make sure your system is upgraded by typing these comments

sudo apt update
sudo apt upgrade

Next, install the default GCC toolchain with:

sudo apt install build-essential

Next, we need to install a few prerequisites for building Python:

sudo apt install libssl-dev zlib1g-dev libncurses5-dev libncursesw5-dev libreadline-dev libsqlite3-dev
sudo apt install libgdbm-dev libdb5.3-dev libbz2-dev libexpat1-dev liblzma-dev tk-dev

At the time of this writing, the latest stable version of Python is 3.6.5, if you want to use a newer version change the next instructions accordingly:

wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz
tar xf Python-3.6.5.tar.xz
cd Python-3.6.5
./configure --enable-optimizations
make -j 8
sudo make altinstall

Once the above is finished, you could invoke the new Python interpreter with:

python3.6

Now everything is working!