diff --git a/matrix/matrix_operation.py b/matrix/matrix_operation.py
index 2580ef85d..002ce6b05 100644
--- a/matrix/matrix_operation.py
+++ b/matrix/matrix_operation.py
@@ -14,9 +14,7 @@ def add(matrix_a: List[list], matrix_b: List[list]) -> List[list]:
     """
     if _check_not_integer(matrix_a) and _check_not_integer(matrix_b):
         _verify_matrix_sizes(matrix_a, matrix_b)
-        matrix_c = [[i + j for i, j in zip(m, n)]
-                    for m, n in zip(matrix_a, matrix_b)]
-        return matrix_c
+        return [[i + j for i, j in zip(m, n)] for m, n in zip(matrix_a, matrix_b)]
 
 
 def subtract(matrix_a: List[list], matrix_b: List[list]) -> List[list]:
@@ -28,9 +26,7 @@ def subtract(matrix_a: List[list], matrix_b: List[list]) -> List[list]:
     """
     if _check_not_integer(matrix_a) and _check_not_integer(matrix_b):
         _verify_matrix_sizes(matrix_a, matrix_b)
-        matrix_c = [[i - j for i, j in zip(m, n)]
-                    for m, n in zip(matrix_a, matrix_b)]
-        return matrix_c
+        return [[i - j for i, j in zip(m, n)] for m, n in zip(matrix_a, matrix_b)]
 
 
 def scalar_multiply(matrix: List[list], n: int) -> List[list]:
@@ -101,9 +97,8 @@ def minor(matrix: List[list], row: int, column: int) -> List[list]:
     >>> minor([[1, 2], [3, 4]], 1, 1)
     [[1]]
     """
-    minor = matrix[:row] + matrix[row + 1:]
-    minor = [row[:column] + row[column + 1:] for row in minor]
-    return minor
+    minor = matrix[:row] + matrix[row + 1 :]
+    return [row[:column] + row[column + 1 :] for row in minor]
 
 
 def determinant(matrix: List[list]) -> int:
@@ -156,8 +151,7 @@ def _shape(matrix: List[list]) -> list:
     return list((len(matrix), len(matrix[0])))
 
 
-def _verify_matrix_sizes(
-        matrix_a: List[list], matrix_b: List[list]) -> Tuple[list]:
+def _verify_matrix_sizes(matrix_a: List[list], matrix_b: List[list]) -> Tuple[list]:
     shape = _shape(matrix_a)
     shape += _shape(matrix_b)
     if shape[0] != shape[2] or shape[1] != shape[3]:
@@ -171,12 +165,9 @@ def _verify_matrix_sizes(
 def main():
     matrix_a = [[12, 10], [3, 9]]
     matrix_b = [[3, 4], [7, 4]]
-    matrix_c = [[11, 12, 13, 14], [21, 22, 23, 24],
-                [31, 32, 33, 34], [41, 42, 43, 44]]
+    matrix_c = [[11, 12, 13, 14], [21, 22, 23, 24], [31, 32, 33, 34], [41, 42, 43, 44]]
     matrix_d = [[3, 0, 2], [2, 0, -2], [0, 1, 1]]
-    print(
-        f"Add Operation, {matrix_a} + {matrix_b}"
-        f" = {add(matrix_a, matrix_b)} \n")
+    print(f"Add Operation, {matrix_a} + {matrix_b} = {add(matrix_a, matrix_b)} \n")
     print(
         f"Multiply Operation, {matrix_a} * {matrix_b}",
         f"= {multiply(matrix_a, matrix_b)} \n",
diff --git a/matrix/searching_in_sorted_matrix.py b/matrix/searching_in_sorted_matrix.py
index 996805d4e..470fc01df 100644
--- a/matrix/searching_in_sorted_matrix.py
+++ b/matrix/searching_in_sorted_matrix.py
@@ -1,9 +1,10 @@
-from typing import List
+from typing import List, Union
 
 
 def search_in_a_sorted_matrix(
-        mat: List[list], m: int, n: int, key: int or float) -> None:
-    '''
+    mat: List[list], m: int, n: int, key: Union[int, float]
+) -> None:
+    """
     >>> search_in_a_sorted_matrix(\
         [[2, 5, 7], [4, 8, 13], [9, 11, 15], [12, 17, 20]], 3, 3, 5)
     Key 5 found at row- 1 column- 2
@@ -16,7 +17,7 @@ def search_in_a_sorted_matrix(
     >>> search_in_a_sorted_matrix(\
         [[2.1, 5, 7], [4, 8, 13], [9, 11, 15], [12, 17, 20]], 3, 3, 2.2)
     Key 2.2 not found
-    '''
+    """
     i, j = m - 1, 0
     while i >= 0 and j < n:
         if key == mat[i][j]:
@@ -38,5 +39,6 @@ def main():
 
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()
     main()