Question

Use the Design Recipe to write a function count_evens_NxN,  that consumes a nested list representing a matrix of size NxN. The function should return the number of even numbers in the matrix. For this function, 0 is considered an even number.  Include a Docstring!

Note: You may assume the list argument passed to the function is a nested list of integers.

Write 3 assert_equal statements to test your function.

Answer 1

Code Screenshot :

Executable Code:

import unittest

#Required function
def count_evens_NxN(nested_list):
   #Variable to store result
   result=0
   #Iterating the matrix
   for i in nested_list:
       for j in i:
           #Checking if the number is even
           if(j%2 == 0):
               #Keep track of even numbers
               result += 1
   #Return the result
   return result

#Class for assert testing
class Testing(unittest.TestCase):
   #3 Tests
   def test1(self):
       self.assertEqual(count_evens_NxN([[1,2],[8,16],[3,4]]), 4)
   def test2(self):
       self.assertEqual(count_evens_NxN([[7], [18]]), 1)
   def test3(self):
       self.assertEqual(count_evens_NxN([[]]), 0)

if __name__ == '__main__':
   unittest.main()

Sample Output :