The way to properly serialize Pickup instance

[ababich]

What is the task:

imagine I need 10 element with weighted probabilities

1. I initialized Pickup object with weights like {a: 80, b: 20} and got result

list = [a a a b a a a a b a]

2. After that I "consumed" 2 first elements: list = [a b a a a a b a]

And I need to fill the end, i.e. pick 2 more items

3. If I init new pickup object with same probabilities I will get different result from what I can have if I will be able to reuse previous (original) object

And these results are worse, especially with low-probability keys

So the easiest way is to serialize and store the initial object but I do not see any straightforward way to do so.

Can you please help?