Refactored Palindrome App

palindrome.py

@@ -0,0 +1,25 @@
+import re
+
+
+def normalizing(user_string):
+    """Removes all nonalpha characters and converts all letters to lowercase"""
+    search_string = re.compile("[^A-Za-z]")
+    return re.sub(search_string, '', user_string).lower()
+
+
+def palindrome(s):
+    """Function that determines if the string is a palindrome"""
+    if len(s) <= 1:
+        return True
+    else:
+        boolean = s[0] == s[-1] and palindrome(s[1:-1])
+        return(boolean)
+
+
+sentence = input("Please enter your sentence or sentences: ")
+
+
+if palindrome(normalizing(sentence)):
+    print("That is a palindrome")
+else:
+    print("That is not a palindrome")