Created
December 5, 2013 20:46
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Shuffle several iterables the same way
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| import random | |
| def coshuffle(*args): | |
| """ | |
| will shuffle target_list and apply | |
| same permutation to other lists | |
| >>> helper.coshuffle([2, 1, 3], [4, 2, 8], [6, 3, 12]) | |
| ([5, 3, 2, 1, 4], [5, 3, 2, 1, 4], [5, 3, 2, 1, 4]) | |
| """ | |
| assert len(args) > 0, "need at least one list" | |
| num_elements = len(args[0]) | |
| for arg in args: | |
| assert len(arg) == num_elements, "length mismatch" | |
| idx = range(num_elements) | |
| random.shuffle(idx) | |
| new_lists = [] | |
| for arg in args: | |
| new_lists.append([arg[i] for i in idx]) | |
| return tuple(new_lists) |
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