🏣 Clean up for arxiv

book/ebook_src/builtin_structures/palindrome.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+
+from collections import defaultdict
+
+def is_palindrome(array):
+    '''
+    >>> is_palindrome('subi no onibus')
+    True
+    >>> is_palindrome('helllo there')
+    False
+    >>> is_palindrome('h')
+    True
+    >>> is_palindrome('')
+    True
+    '''
+    array = array.strip(' ')
+    if len(array) < 2:
+        return True
+
+    if array[0] == array[-1]:
+        return is_palindrome(array[1:-1])
+    else:
+        return False
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()
+