diff --git a/DIRECTORY.md b/DIRECTORY.md
index 0c00d5ca7f70..eba63e17eaff 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -449,6 +449,7 @@
   * [Find Min Recursion](https://github.com/TheAlgorithms/Python/blob/master/maths/find_min_recursion.py)
   * [Floor](https://github.com/TheAlgorithms/Python/blob/master/maths/floor.py)
   * [Gamma](https://github.com/TheAlgorithms/Python/blob/master/maths/gamma.py)
+  * [Gamma Recursive](https://github.com/TheAlgorithms/Python/blob/master/maths/gamma_recursive.py)
   * [Gaussian](https://github.com/TheAlgorithms/Python/blob/master/maths/gaussian.py)
   * [Greatest Common Divisor](https://github.com/TheAlgorithms/Python/blob/master/maths/greatest_common_divisor.py)
   * [Greedy Coin Change](https://github.com/TheAlgorithms/Python/blob/master/maths/greedy_coin_change.py)
diff --git a/ciphers/a1z26.py b/ciphers/a1z26.py
index e6684fb1e6fc..0f0eb7c5c083 100644
--- a/ciphers/a1z26.py
+++ b/ciphers/a1z26.py
@@ -5,6 +5,7 @@
 https://www.dcode.fr/letter-number-cipher
 http://bestcodes.weebly.com/a1z26.html
 """
+from __future__ import annotations
 
 
 def encode(plain: str) -> list[int]:
diff --git a/ciphers/enigma_machine2.py b/ciphers/enigma_machine2.py
index f4ce5a075f46..9252dd0edbf7 100644
--- a/ciphers/enigma_machine2.py
+++ b/ciphers/enigma_machine2.py
@@ -14,6 +14,7 @@
 
 Created by TrapinchO
 """
+from __future__ import annotations
 
 RotorPositionT = tuple[int, int, int]
 RotorSelectionT = tuple[str, str, str]
diff --git a/ciphers/trafid_cipher.py b/ciphers/trafid_cipher.py
index 1c8ea3024d33..b12ceff72907 100644
--- a/ciphers/trafid_cipher.py
+++ b/ciphers/trafid_cipher.py
@@ -1,4 +1,5 @@
 # https://en.wikipedia.org/wiki/Trifid_cipher
+from __future__ import annotations
 
 
 def __encryptPart(messagePart: str, character2Number: dict[str, str]) -> str:
diff --git a/ciphers/xor_cipher.py b/ciphers/xor_cipher.py
index 12d580e720bc..ca9dfe20f7b6 100644
--- a/ciphers/xor_cipher.py
+++ b/ciphers/xor_cipher.py
@@ -16,6 +16,7 @@
         - encrypt_file : boolean
         - decrypt_file : boolean
 """
+from __future__ import annotations
 
 
 class XORCipher:
@@ -41,17 +42,10 @@ def encrypt(self, content: str, key: int) -> list[str]:
 
         key = key or self.__key or 1
 
-        # make sure key can be any size
-        while key > 255:
-            key -= 255
-
-        # This will be returned
-        ans = []
-
-        for ch in content:
-            ans.append(chr(ord(ch) ^ key))
+        # make sure key is an appropriate size
+        key %= 255
 
-        return ans
+        return [chr(ord(ch) ^ key) for ch in content]
 
     def decrypt(self, content: str, key: int) -> list[str]:
         """
@@ -66,17 +60,10 @@ def decrypt(self, content: str, key: int) -> list[str]:
 
         key = key or self.__key or 1
 
-        # make sure key can be any size
-        while key > 255:
-            key -= 255
-
-        # This will be returned
-        ans = []
-
-        for ch in content:
-            ans.append(chr(ord(ch) ^ key))
+        # make sure key is an appropriate size
+        key %= 255
 
-        return ans
+        return [chr(ord(ch) ^ key) for ch in content]
 
     def encrypt_string(self, content: str, key: int = 0) -> str:
         """