The Monte-Hall Problem.
There are three concealed baskets, one with a gold bullion and the rest with snakes.
In your mind you pick a basket. But as you reach to uncover it, a snake pops out of an adjacent basket and you hesitate on your original decision.
There remain two baskets. Will you be better off changing your original guess? Does it make a difference?
This code will tell you!
-An exercise for new python users.