import random

# stream shuffling can be done if the output stream has random read/write
# we use the fisher yates shuffling algorithm

input_list = [1,2,3,4,5]

output_list = []

for (i, v) in enumerate(input_list):
    output_list.append(v)
    j = random.randint(0, i)
    if j != i:
        output_list[i] = output_list[j]
        output_list[j] = v

# if the output stream was a fixed size stream

output_list = [None] * len(input_list)

for (i, v) in enumerate(input_list):
    j = random.randint(0, i)
    if j != i:
        output_list[i] = output_list[j]
    output_list[j] = v