Did my python just try and Bite me?

[xFenrir]

So, I'm totally & completely not worried about being bitten.
However, for the people that bring snakes to school classrooms to be pet and such.. how do they ensure the random time a BP does bit, it's not one of the children interacting during the demo?

You can never be 100% certain that they won't. Most people who bring along snakes as educational animals have had them for years and know that the odd of them biting people are slim. It's just knowing the personality of the snake. Most snake bites are either defensive strikes or feeding responses, so if you don't scare them and you don't act like food, chances are they won't bite.