A simple python module that is meant to simulate the action of shuffling a python List as if it were a deck of cards.

Predictable behaviours that make a human riffle shuffle imperfect

• Once a deck of cards is divided to each hand, the amount of cards in each hand is not (likely) equal.
• As each thumb releases from it's half of the deck, sometimes more than one card drops from a single hand at a time.
• As the deck in each hand gets more and more thin, the probability of larger chucks of cards dropping from each hand increases.

shuffle.riffle(List original[, int shuffles])

Predictable behaviours that make a human overhand shuffle imperfect

• Random amounts of cards (chunks) are taken from the top and placed placed in the opposite hand in reverse order (retaining the order within each chunk)

shuffle.overhand(List original[, int shuffles])

A very predictable shuffle, alternating placing the top card on the bottom/top of the new deck

shuffle.mongean(List original[, int shuffles])

Predictable shuffle, dealing items into N piles and then rejoining the piles

shuffle.pile(List original, int piles[, int shuffles])

Now available via pip

sudo pip install shuffle

Or

git clone git://github.com/jondavidjohn/Card-Shuffle-for-Python.git shuffle
cd ./shuffle
sudo python setup.py install

Linux Users - Make sure you have the python-dev package installed

import shuffle

riffled_list = shuffle.riffle(original_list, 3)  # riffles the list 3 times
overhanded_list = shuffle.overhand(original_list, 2)  #overhand's the list 2 times
mongeaned_list = shuffle.mongean(original_list, 5)  #mongean shuffle 5 times
piled_list = shuffle.pile(original_list, 3, 6)  #pile shuffle, using 3 piles, 6 times