Loops over arrays (2)

View array as one-dimensional and iterate over all elements:
for e in a.ravel():
    print e
Use ravel() only when reading elements, for assigning it is better to use shape or reshape first!
For loop over all index tuples and values:
>>> for index, value in ndenumerate(a):
...     print index, value
...
(0, 0) 2.0
(0, 1) 6.0
(0, 2) 12.0
(1, 0) 4.0
(1, 1) 12.0
(1, 2) 24.0

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