import numpy as np

a=np.array([2,4,5])

print("Original array is :")

print(a)

print("Modified array is:")

for x in np.nditer(a):

       print(x)

​

import numpy as np

a=np.array([[2,4,5],[3,6,7],[4,8,9]])

print("Original array is :")

print(a)

print("Modified array is:")

for x in np.nditer(a, flags = ['external_loop'],order='F'):

        print(x)

​

>>> def iter_add(x, y, out=None):

...    addop = np.add

...    it = np.nditer([x, y, out], [],

...                [['readonly'], ['readonly'], ['writeonly','allocate']])

...    with it:

...        while not it.finished:

...            addop(it[0], it[1], out=it[2])

...            it.iternext()

...        return it.operands[2]

​