[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

ciphers/columnar_transposition_cipher.py

@@ -1,9 +1,10 @@
 import math
 
+
 def encrypt_columnar_cipher(message: str, key: str) -> str:
     """
     Encrypts a message using the Columnar Transposition Cipher.
-    
+
     :param message: Text to encrypt.
     :param key: String key used to define column order.
     :return: Encrypted message.
@@ -12,23 +13,23 @@ def encrypt_columnar_cipher(message: str, key: str) -> str:
     message = message.replace(" ", "")
     num_cols = len(key)
     num_rows = math.ceil(len(message) / num_cols)
-    
+
     # Fill the grid with characters
-    grid = [''] * num_cols
+    grid = [""] * num_cols
     for i, char in enumerate(message):
         grid[i % num_cols] += char
 
     # Sort columns based on the key order
     sorted_key_indices = sorted(range(len(key)), key=lambda k: key[k])
-    ciphertext = ''.join([grid[i] for i in sorted_key_indices])
+    ciphertext = "".join([grid[i] for i in sorted_key_indices])
 
     return ciphertext
 
 
 def decrypt_columnar_cipher(ciphertext: str, key: str) -> str:
     """
     Decrypts a message encrypted with the Columnar Transposition Cipher.
-    
+
     :param ciphertext: Encrypted text.
     :param key: String key used to define column order.
     :return: Decrypted message.
@@ -41,17 +42,17 @@ def decrypt_columnar_cipher(ciphertext: str, key: str) -> str:
     sorted_key_indices = sorted(range(len(key)), key=lambda k: key[k])
     col_lengths = [num_rows] * num_cols
     for i in range(num_shaded_boxes):
-        col_lengths[sorted_key_indices[-(i+1)]] -= 1
+        col_lengths[sorted_key_indices[-(i + 1)]] -= 1
 
     # Distribute ciphertext into columns based on the sorted key
     grid = []
     start = 0
     for col_length in col_lengths:
-        grid.append(ciphertext[start:start + col_length])
+        grid.append(ciphertext[start : start + col_length])
         start += col_length
 
     # Rebuild plaintext row by row
-    plaintext = ''
+    plaintext = ""
     for i in range(num_rows):
         for j in range(num_cols):
             if i < len(grid[sorted_key_indices[j]]):