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

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Author: pre-commit-ci[bot]

cryptography/playfire.ipynb

@@ -33,41 +33,41 @@
    "source": [
     "class PlayFire:\n",
     "    \"\"\"\n",
-    "    PlayFire class implements the Playfair \n",
+    "    PlayFire class implements the Playfair\n",
     "    cipher for encryption and decryption of messages.\n",
     "\n",
-    "    The Playfair cipher is a digraph substitution \n",
+    "    The Playfair cipher is a digraph substitution\n",
     "    cipher that encrypts pairs of letters. It requires a key, which\n",
-    "    is used to create a 6x6 matrix of letters and \n",
+    "    is used to create a 6x6 matrix of letters and\n",
     "    digits, and processes the message in pairs.\n",
     "\n",
     "    Attributes:\n",
     "    key (str): The key used to generate the matrix.\n",
-    "    key_matrix (list): The 6x6 matrix used for \n",
-    "    encryption and decryption.extra (str): The extra character \n",
+    "    key_matrix (list): The 6x6 matrix used for\n",
+    "    encryption and decryption.extra (str): The extra character\n",
     "    used to pad the message if the length is odd (default is 'x').\n",
     "\n",
     "    Methods:\n",
-    "    __verify_key(key): Verifies that the key is \n",
+    "    __verify_key(key): Verifies that the key is\n",
     "        valid (contains unique characters).\n",
-    "    __make_matrix(): Creates a 6x6 matrix using \n",
+    "    __make_matrix(): Creates a 6x6 matrix using\n",
     "        the key and the remaining letters/digits.\n",
-    "    find_idx(pair): Finds the positions (row and column indices) \n",
+    "    find_idx(pair): Finds the positions (row and column indices)\n",
     "        of the pair of characters in the matrix.\n",
-    "    encrypt(msg): Encrypts the given message using \n",
+    "    encrypt(msg): Encrypts the given message using\n",
     "        the Playfair cipher.\n",
-    "    decrypt(msg): Decrypts the given encrypted \n",
+    "    decrypt(msg): Decrypts the given encrypted\n",
     "        message using the Playfair cipher.\n",
     "    \"\"\"\n",
     "\n",
     "    def __init__(self, key, extra=\"x\"):\n",
     "        \"\"\"\n",
-    "        Initializes the PlayFire cipher with a key and \n",
+    "        Initializes the PlayFire cipher with a key and\n",
     "            an optional extra character for padding.\n",
     "\n",
     "        Parameters:\n",
     "        key (str): The key to generate the cipher matrix.\n",
-    "        extra (str, optional): The character used for \n",
+    "        extra (str, optional): The character used for\n",
     "            padding the message if its length is odd. Defaults to 'x'.\n",
     "        \"\"\"\n",
     "        self.key = self.__verify_key(key)\n",
@@ -82,7 +82,7 @@
     "        key (str): The key to verify.\n",
     "\n",
     "        Returns:\n",
-    "        str: The valid key if it contains only unique \n",
+    "        str: The valid key if it contains only unique\n",
     "            characters, else prints an error.\n",
     "        \"\"\"\n",
     "        keyy = []\n",
@@ -96,7 +96,7 @@
     "\n",
     "    def __make_matrix(self):\n",
     "        \"\"\"\n",
-    "        Creates a 6x6 matrix from the key by filling \n",
+    "        Creates a 6x6 matrix from the key by filling\n",
     "            in remaining characters of the alphabet and digits.\n",
     "\n",
     "        Returns:\n",
@@ -115,15 +115,15 @@
     "\n",
     "    def find_idx(self, pair):\n",
     "        \"\"\"\n",
-    "        Finds the row and column indices of the \n",
+    "        Finds the row and column indices of the\n",
     "            characters in the matrix.\n",
     "\n",
     "        Parameters:\n",
-    "        pair (list): A pair of characters whose \n",
+    "        pair (list): A pair of characters whose\n",
     "            positions are to be found in the matrix.\n",
     "\n",
     "        Returns:\n",
-    "        list: A list containing the row and column \n",
+    "        list: A list containing the row and column\n",
     "            indices of both characters in the matrix.\n",
     "        \"\"\"\n",
     "        idxs = [6, 6]\n",