# itertools.product

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itertools.product is a little known function that can be useful for iterating rows or columns of a matrix.

1(0, 0)(0, 1)(0, 2)(0, 3)(0, 4)
2(1, 0)(1, 1)(1, 2)(1, 3)(1, 4)
3(2, 0)(2, 1)(2, 2)(2, 3)(2, 4)
4(3, 0)(3, 1)(3, 2)(3, 3)(3, 4)


Say you want to select the two outer columns of this matrix:

1from itertools import product as prod
2for ind in prod(range(4), [0, 4]):
3    print(ind)