Python nested looping Idiom

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You can use itertools.product:

>>> for x,y,z in itertools.product(range(2), range(2), range(3)):
...     print x,y,z
... 
0 0 0
0 0 1
0 0 2
0 1 0
0 1 1
0 1 2
1 0 0
1 0 1
1 0 2
1 1 0
1 1 1
1 1 2

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