Finish caesar cipher encryption

Author: rjLelis

password-storage/caesar_cipher.py

@@ -0,0 +1,29 @@
+
+def encrypt(original_message, key):
+    '''
+        Encrypts a message using the caesar cypher
+
+        :params original_message, key
+        :returns encrypted_message
+    '''
+
+    alphabet = ('a', 'b', 'c', 'd', 'e', 'f',
+                'g', 'h', 'i', 'j', 'k', 'l', 'm',
+                'n', 'o', 'p', 'q', 'r', 's', 't',
+                'u', 'v', 'w', 'x', 'y', 'z')
+
+    encrypted_message = ''
+
+    # Encrypts the original message then stores in the return variable
+    for letter in original_message:
+        encrypted_letter = ''
+        if letter.lower() not in alphabet:
+            encrypted_letter = letter
+        elif alphabet.index(letter) + key >= len(alphabet):
+            encrypted_letter = \
+                alphabet[alphabet.index(letter) + key - len(alphabet)]
+        else:
+            encrypted_letter = alphabet[alphabet.index(letter) + key]
+        encrypted_message += encrypted_letter
+
+    return encrypted_message