Python3 Python 3 how to use result from randint to evaluate an array and pull the correct choice

I am using Python3. I am trying to evaluate "skill checks" for my game, and I want to create a function, that can be evluated for all, standard skill rolls (keepin' it DRY!). Now, I'm only at the most basic level for now, so, I'm just trying to create the function itself, then later, I want to use my database, but for now:

1) My game uses success "thresholds", which, 2) when I'm rolling dice (it was a pen-n-paper game, but, handling the dice rolls takes forever), takes the results - 3) compares it to a range of numbers, and tells you how well you failed/succeeded.

Desired flow: 1) 1-100 is rolled. 2) [ignored for this question]: if a 96+ is rolled, roll again and add the results. 3) List/Array/Dictionary/Whatever (later DataBase) is checked and the appropriate type of success is generated.

What I don't know are:

1) How do I build this list? Should this be a dictionary, a list, or a tuple? 2) What do I do once I have generated a random number? What do I do with that number in order to evaluate my list of thresholds?

Thresholds and their Ranges: Total Failure: 1-25, Partial Failure: 26-49, Partial Success: 50-74, Success: 75-100, Significant Success: 101-149, Astounding Success: 150-199, Epic Success: 200-249, Legendary: 250+

Thank you all, in advance, for any help.