Help Wanted in Probability Calculator Challenge

Python
#1

Tell us what’s happening:
Hello, I am having an issue with my Probability Calculator when writing the experiment function. For each num_experiments I am making a deep copy of the hat and calling the draw method with num_balls_drawn. This results in an “IndexError: list index out of range”… I am quite confused because the draw method seems to work otherwise…

Any help will be greatly appreciated. Thank you!

Your code so far
https://repl.it/@ariyosh/boilerplate-probability-calculator#prob_calculator.py

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Challenge: Probability Calculator

Link to the challenge:

#2

Take a closer look at what happens inside of the draw method.

For n_draws times:

  • drawn index of the ball is picked
  • ball matching one with on the drawn index is removed from balls_left list, keep in mind that remove method removes the first matching occurrence from the list.
  • ball matching one on the drawn index is added to the balls_drawn list

Do you see what is not right here? Try to go step-by-step through this, you might add temporally print calls to see what is going on in the affected variables.

#3

Thank you for your help! As you suggested the temporary print calls helped me figure out that the stopping point for random.randint(start, stop) had to be reduced by 1.