random.shuffle(list) produces empty list - why?

[Yoriz]

SelectedTargets is shuffled. The function does not return anything it alters the passed in object.

Example

import random
selected_targets = [1, 2, 3, 4, 5]
random.shuffle(selected_targets)
print(selected_targets)

Output:
[1, 2, 5, 4, 3]

If you want to keep selected_targets as it is and get a new shuffled list, you can use sample with the full list size.

target_pool = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
no_of_targets_to_select = 5
selected_targets = random.sample(target_pool, no_of_targets_to_select)
print(selected_targets)
sessions2 = random.sample(selected_targets, len(selected_targets))
print(sessions2)

Output:
[4, 7, 6, 5, 9]
[9, 4, 6, 7, 5]