added encrypt and decrypt function

Author: Kalebu

app.py

@@ -0,0 +1,14 @@
+def encrypt(text, key=0):
+ if not isinstance(text, str):
+ raise TypeError("{} should be a type string".format(text))
+ if not isinstance(key, int):
+ raise TypeError("{} should be of type int".format(key))
+ return "".join([chr(ord(something) + key) for something in text])
+
+
+def decrypt(text, key=0):
+ if not isinstance(text, str):
+ raise TypeError("{} should be a type string".format(text))
+ if not isinstance(key, int):
+ raise TypeError("{} should be of type int".format(key))
+ return "".join([chr(ord(something) - key) for something in text])