Shuffle a deque

I am having trouble understanding how to shuffle a deque. let say I have these two deques (weather order or not ) and want to shuffle them. Why I am getting none here.

import random
from collections import deque

a = deque([1, 2, 3])
b = deque([4, 5, 6])

a += b



Shuffle mutates passed argument in place, does not return shuffled result.

Example taken from w3s:

import random

mylist = ["apple", "banana", "cherry"]


Python documentation says:

To shuffle an immutable sequence and return a new shuffled list, use sample(x, k=len(x)) instead.

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