Check if all elements in a 2d array are equal to 1 in Python [duplicate]

Question

What's the most Python way to do this, other than iterating through nested loops and checking if each value is equal to 1?

Answer 1

If you're using numpy you can use its per-element equality check and then call the resulting arrays all method to check if all elements did satisfy the condition:

>>> import numpy as np
>>> c = np.array([[1,2], [3,4]])
>>> (c==1).all()
False
>>> c = np.array([[1,1], [1,1]])
>>> (c==1).all()
True