The question is in bold and the rest is there for support , to explain concepts  Write a function triple_riffle(mylist) which takes as input a list (which for convenience we will always take with length a multiple of 3) and outputs the result of a 3-way riffle shuffle . For example: an input of range(9) should output [6,3,0,7,4,1,8,5,2].   Write a function triple_riffle_repeat(mylist,n) which takes as input a list (again with length a multiple of 3) and outputs the result of doing a 3-way riffle shuffle n times.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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The question is in bold and the rest is there for support , to explain concepts 

Write a function triple_riffle(mylist) which takes as input a list (which for convenience we will always take with length a multiple of 3) and outputs the result of a 3-way riffle shuffle . For example: an input of range(9) should output [6,3,0,7,4,1,8,5,2]. 

 Write a function triple_riffle_repeat(mylist,n) which takes as input a list (again with length a multiple of 3) and outputs the result of doing a 3-way riffle shuffle n times.

Faro shuffle is when a deck of cards is split exactly in half and then the two halves are interleaved exactly. There are two versions: an out-shuffle where the card in position 1 stays where it is (and likewise the card in the last position stays there), and an in-shuffle where the card in position 1 moves to position 2 (and the card in last position moves up one). The following code prints the result of a Faro out-shuffle on the list [1,2,...,52].

deck = list(range(1,53))
firsthalf, secondhalf = deck[:26], deck[26:]
shuffleddeck = []
for i in range(26):
    shuffleddeck.extend([firsthalf[i],secondhalf[i]])
print(shuffleddeck)
With the aid of a computer (because it is not easy to do with only two hands!) we can also consider shuffles which split the deck into three (or more) piles, and then riffle them together. For instance, given the list [0,1,2,3,4,5,6,7,8] a 3-way riffle would split it into three piles: A=[0,1,2],  B = [3,4,5],  C=[6,7,8] and then interleaving them in the order CBA (of course there are other choices) to obtain a shuffled list of [6,3,0,7,4,1,8,5,2].
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