[Python] Iterating through numbers of a 2d array one at a time

I'm trying to iterate through a 2d array, but instead of iterating in rows, I want it to iterate through each number individually. The code currently looks like this:

import numpy as np
M = np.array([[1,1,1], [1,1,4], [1,1,1]])
for row in M[0]:
print(row, sep=' ')


This code iterates through each item by row, which is a problem. For example, if I want to use an if statement to check what number it is currently iterating:

for row in M[0]:
if row == 1
print(2)
else
print(3)


It comes up with the error message:

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()


I know what this error means, but do not know how I would fix it.

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