palindrome example, http://stackoverflow.com/questions/931092/reverse-a-string-in-python

palindrome/palindrome.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+
+"""Finds the largest palindrome in a string."""
+
+import string
+import re
+
+def largest(phrase):
+    """Return the largest palindrome inside the phrase."""
+    regex = re.compile('[{punctuation}]'.format(
+        punctuation=string.punctuation))
+    clean_phrase = regex.sub('', phrase).replace(' ', '')
+    reverse_phrase = clean_phrase[::-1]
+
+    # print 'Clean:', clean_phrase
+    # print 'Reverse:', reverse_phrase
+
+    max_palindrome = None
+    for pos in range(3, len(clean_phrase) + 1):
+        # print pos,
+        if reverse_phrase[:pos] in clean_phrase:
+            # print 'yes'
+            max_palindrome = pos
+        else:
+            # print 'no'
+            break
+
+    return max_palindrome
+
+
+def main():
+    """Main code."""
+    phrase = raw_input('Phrase: ')
+    large = largest(phrase)
+    print 'Max palindrome found:', large
+
+
+if __name__ == '__main__':
+    main()