For a laugh, I downloaded the source to python 3.6.6 from python.org, and compiled it. It worked a charm, no problems - although I didn"t play with/modify the config. I installed it to /home/nemo/python so I could create a tarball. It is too large to attach (46M), but you could easily do the compiling yourself. Install the gcc compiler, download the source from python.org, then do this:
start the terminal
if you downloaded the source to Downloads, go there (cd Downloads), and uncompress the file with:
tar xvf your_downloaded_filename
cd python3.6.6 (or whichever one you downloaded)
./configure
make
make test
sudo make install (if the test passed)
Hope this helps.