Create Rot13.py

Author: AG-Systems

Codewars/Rot13.py

@@ -0,0 +1,25 @@
+def rot13(message):
+    rot_13_string = [""] * len(message)
+    # z = 97 - 122
+    # capital = 65 - 90
+    shift = 13
+    for index in range(0, len(message)):
+        letter = message[index]
+        if 97 <= ord(letter) <= 122 or 65 <= ord(letter) <= 90:
+            is_capital = False
+            if letter.isupper():
+                is_capital = True
+                letter = letter.lower()
+            new_letter = ord(letter) - 97
+            new_letter += shift
+            if new_letter > 26:
+                new_letter -= 26
+            new_letter += 97
+            new_letter = chr(new_letter) 
+            if is_capital:
+                new_letter = new_letter.upper()
+            rot_13_string[index] = new_letter
+        else:
+            rot_13_string[index] = letter
+      
+    return "".join(rot_13_string)