calculate.py

def calculate_sum_of_corners(matrix):
  """
  Función que retorna la suma de 4 esquinas de una matriz en python
  """
	up_left = matrix[0][0]
	up_right = matrix[0][-1]
	down_left = matrix[-1][0]
	down_right = matrix[-1][-1]

	result = up_left + up_right + down_left + down_right

	return result


def calculate_sum_of_corners2(matrix):

	suma = 0
	for i in range(len(matrix)):
		for j in range(len(matrix[0])):
			if(i == 0 and j == 0):
				# Esquina superior izquierda
				suma += matrix[i][j]
			elif(i == 0 and j == len(matrix[0])-1):
				# Esquina superior derecha
				suma += matrix[i][j]
			elif(i == len(matrix)-1 and j == 0):
				# Esquina inferior izquierda
				suma += matrix[i][j]
			elif(i == len(matrix)-1 and j == len(matrix[0])-1):
				# Esquina inferior derecha
				suma += matrix[i][j]


	return suma

#Ejemplo
target_matrix = [[100, 1, 1, 100],
				[1, 1, 1, 1],
				[1, 1, 1, 1],
				[100, 1, 1, 100]
				]


print(calculate_sum_of_corners(target_matrix))
print(calculate_sum_of_corners2(target_matrix))