The reticulated Python in this picture didn't get any further than what is shown. A Large retic or a large anaconda can kill a person in 3 minutes. not of suffocation but of high blood pressure and ruptured blood vessels. thats faster then a poisionous snake.
Most snakes do not attack people though.
Personally I love snakes and Own a 6 foot common boa and a 3.5 foot Ball python. beautiful creatures they are!
I have 3 royal/ball pythons, 4 bci's with special markings (we're proving out the markings), 2 albino burms and a albino green burmese. I love my snakes and would not be without them. The biggest is about 14ft now