Installation documentation not clear for python (or any ?)

I start to create Sync function for python. 
https://github.com/OpenFunction/samples/tree/main/functions/knative/hello-world-python

Run it locally implies "pack" ? How to install it ? etc. Can we use docker / podman or any ? 

Also an architecture overview would be great to see all the dependencies from one look. 
Regards, 