import random
treatments = ["random", "merit", "patronage"]
remaining_treatments = list(range(len(treatments))) # integer array keeping track of remaining treatments that are unassigned

num_test = 30
while num_test != 0:
    if not remaining_treatments: # Case when remaining_treatments list is empty -> meaning all treatments have been already been assigned once before
        print("\n")
        remaining_treatments = list(range(len(treatments))) # resetting the list

    random_treatment_index = random.choice(remaining_treatments)
    group_treatment = treatments[random_treatment_index]
    print('set condition to', group_treatment)
    remaining_treatments.remove(random_treatment_index)

    num_test -= 1