a mongoose exploits the way a cobra sees and defends itself. They move in such a way as to distract and confuse it then wear it down. Not all snakes react to predation the same as a cobra. A ball python certainly doesn't act like a cobra when threatened. But lets be realistic. A full grown anaconda or reticulated python would have no problem dispatching a weasel or ferret...providing, of course, it could actually get a hold of it.