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Code,that will flatten an array of arbitrarily nested arrays of integers into a flat array of integers
flatten = lambda x: [y for l in x for y in flatten(l)] if type(x) is list else [x]
a = [1, 2, [3, 4], [[5, 6], [7, 8]]]
print flatten(a)
# This will print a list [1, 2, 3, 4, 5, 6, 7, 8]
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