Parallel python versions

Some project have strict dependencies, and requires additional python 3.x versions to manage the dependencies.
This describes a walkthrough of a build of python 3.5.6 from a source tarball.

Just go to python.org Download section and copy the download link to a python version of your need:

cd /usr/local/src
wget https://www.python.org/ftp/python/3.5.6/Python-3.5.6.tgz
tar xvf Python-3.5.6.tgz
cd Python-3.5.6
./configure --enable-optimizations --with-ensurepip=install
make -j 8
make install
python3.5 -V

As you see, the steps are straight forward.
The only one dependencies you have to install, are the build essential tools aka. C compiler.