This requires python3.6.

Get source from here : https://github.com/pallets/cachelib
python3.6 setup.py build
sudo python3.6 setup.py install --root=/tmp/cachelib
cd /tmp
sudo find . -not -type d (Find and remove __pycache__ directories and its files)
sudo mksquashfs cachelib/ python3.6-cachelib.tcz
Done.