This shit doesn't work

caesar.py

@@ -26,9 +26,8 @@ for char in txt_list: # loop through all of the chars
     print("Decrypting char-index: " + str(charindex) + " (" + char + ")")
 
     index = index + in_key # shift the alphabet
-    while( index >= alen ): #cycle through the alphabet 
+    while( index > alen - 1 ): #cycle through the alphabet 
-        diff = (index + in_key) - (alen - 1)
+        index = (index + in_key) - (alen - 1)
-        index = 0 + diff # a bit spaghetti but who doesn't like spaghetti
 
     decryp_list[charindex] = alphabet[in_alphabet][index]