qpl

def qpl(sz, index):
    if len(sz) == index:
        print(sz)
        return
    else:
        for x in range(index, len(sz)):
            if x == 0:
                new_array = sz[:]
                qpl(new_array, index + 1)
            else:
                temp = sz[0]
                sz[0] = sz[x]
                sz[x] = temp
                new_array = sz[:]
                qpl(new_array, index + 1)


def main():
    a = [1, 2, 3, 4]
    qpl(a, 0)


main()