Randomizing outcome lists

Builder
1

PsychoPy version : 2026.1.3

I am running a modified Iowa Gambling Task (IGT) and have different outcome lists associated with 2 card choices. I would like to randomize the outcomes (how much money they win or lose when they choose a certain card) for each participant and so far the code for using just one set out outcomes works great but I would like to add a few more sets of possible outcomes. I’m fairly new to the coding on Python so I’m not quite sure where to start.

Here is a screenshot of my current code with just one set of outcomes, Good and Bad outcomes lists. I had a Jupyter notebook code generate the list of money values then copy and pasted those values into this Python code.

Screenshot 2026-07-09 151135
Screenshot 2026-07-09 1511351803×1101 33.6 KB

2

Are there any constraints on the lists? Could you create the lists dynamically here instead of in Jupyter?

3

There are 400 trials in the task overall so it would be very tedious. I also have applied mean winning and mean losing values to the good and bad decks, needing the winning and losing values to occur randomly on 50% of the trials. So it’s just easier to do in Juypter!

4 
G_outcomes_list = []
B_outcomes_list = []
G_mean_winning = 100
G_mean_losing = -75
B_mean_winning = 75
B_mean_losing = -100

for Idx in range(200):
     G_outcomes_list.append((randint(5)-2)*25 + G_mean_winning)
     G_outcomes_list.append((randint(5)-2)*25 + G_mean_losing)
     B_outcomes_list.append((randint(5)-2)*25 + B_mean_winning)
     B_outcomes_list.append((randint(5)-2)*25 + B_mean_losing)
shuffle(G_outcomes_list)
shuffle(B_outcomes_list)

I’m sure this isn’t exactly what you want, but it’s one way of generating something that would work.