Addition and multiplication algorithm of two square matrix

matrix/matrix_multiplication_addition.py

@@ -0,0 +1,36 @@
+def add(matrix_a, matrix_b):
+    rows = len(matrix_a)
+    columns = len(matrix_a[0])
+    matrix_c = []
+    for i in range(rows):
+        list_1 = []
+        for j in range(columns):
+            val = matrix_a[i][j] + matrix_b[i][j]
+            list_1.append(val)
+        matrix_c.append(list_1)
+    return matrix_c
+
+
+def multiply(matrix_a, matrix_b):
+    matrix_c = []
+    n = len(matrix_a)
+    for i in range(n):
+        list_1 = []
+        for j in range(n):
+            val = 0
+            for k in range(n):
+                val = val + matrix_a[i][k] * matrix_b[k][j]
+            list_1.append(val)
+        matrix_c.append(list_1)
+    return matrix_c
+
+
+def main():
+    matrix_a = [[12, 10], [3, 9]]
+    matrix_b = [[3, 4], [7, 4]]
+    print(add(matrix_a, matrix_b))
+    print(multiply(matrix_a, matrix_b))
+
+
+if __name__ == '__main__':
+    main()