How to iterate on a changing dictionary

[Florencio Cano]

> To make an example: imaging Bingo.Shuffle the numbers, each number sorted
> should be removed from the container, how would it implemented?

The structure seems a set -> unordered collection of unique elements.

You can select a random element from the set with
random.sample(container, num_of_elems)

And then remove the elem from the set with remove.