Humans recognise pythons as one of the major threat if their population were not controlled effectively
Indeed true.
There was a time in my state, a python swallowed a cow. Unfortunately for the python, it could not feel comfortable after swallowing the cow. On the bid to feel relaxed, a nearby person(perhaps professional hunter) killed it(the python)
After a meal, particularly a large prey, they would be unable to or less mobile. The digestion process would take a lot of times and energy for them, so it will remain passive (just for a while though).