Function to shuffle a list completely

Online experiments
1

I need a function to shuffle a list e.g. a = [1, 2, 3, 4] so that the order becomes completely different (the number at each position is different from the original one). I find the following code (with some modifications), but the zip() function cannot be translated to JS automatically.

import random

def shuffle_list(some_list):
    randomized_list = some_list[:]
    while True:
        random.shuffle(randomized_list)
        for a, b in zip(some_list, randomized_list):
            if a == b:
                break
        else:
            return randomized_list

I tried to modify it as the follow but it can only partly shuffle the order:

def myFun_shuffle_sequence_order(study_order_list, sl):
    test_order_list = study_order_list[:]
    while True:
        shuffle(test_order_list)
        for i in range(sl):
            for j in range(sl):
                if i == j and test_order_list[i] == study_order_list[j]:
                    break
        else:
            return test_order_list

shuffle_sequence_order = myFun_shuffle_sequence_order

I’d appreciate if there is any suggestion on how to accomplish this both offline and online! Thanks as always.

2

Are you avoiding shuffle(myList) because some elements may end up in the unchanged?

3

Yes, I want it to be completely shuffled so that the number at each position is different from the old one.

4

Shouldn’t this be

for i in range(sl):
          if test_order_list[i] == study_order_list[i]:
              break
5

Oh yes! Seems it’s working. Sorry I overthought. Thanks!

6

Hi Wake, sorry to bother you again-do you have any idea how to translate this code to JS? With the automatic translation the online exp got stuck with no error. I tried to modify it but cannot make it run. Or is there an easier way to accomplish my goal? Thanks!

This is my Python code, offline, it suffles a list completely with no problem.

def myFun_shuffle_sequence_order(study_order_list, sl):
    test_order_list = study_order_list[:]
    while True:
        shuffle(test_order_list)
        for i in range(sl):
            if test_order_list[i] == study_order_list[i]:
                break
        else:
            return test_order_list

shuffle_sequence_order = myFun_shuffle_sequence_order

The automatic translated JS code (I search online JS does not have the for/else loop as in Python, that’s might be the problem):

function myFun_shuffle_sequence_order(study_order_list, sl) {
    var test_order_list;
    test_order_list = study_order_list.slice(0);
    while (true) {
        shuffle(test_order_list);
        for (var i, _pj_c = 0, _pj_a = range(sl), _pj_b = _pj_a.length; (_pj_c < _pj_b); _pj_c += 1) {
            i = _pj_a[_pj_c];
            if ((test_order_list[i] === study_order_list[i])) {
                break;
            }
        }
    }
}
shuffle_sequence_order = myFun_shuffle_sequence_order;