numpy-nditer

it = np.nditer(array, flags=['multi_index']while not it.finished:        s = it.iterindex    y,x = it.multi_index    v = it.value    it.iternext()

-------------------------reference---------------

1. https://docs.scipy.org/doc/numpy/reference/generated/numpy.nditer.html

2. http://blog.csdn.net/lanchunhui/article/details/55657135