add boilerplate for second edition

first_edition/ebook_src/builtin_structures/anagram.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+from collections import Counter
+
+def is_anagram(s1, s2):
+    '''
+    >>> is_anagram('cat', 'tac')
+    True
+    >>> is_anagram('cat', 'hat')
+    False
+    '''
+    counter = Counter()
+    for c in s1:
+        counter[c] += 1
+
+    for c in s2:
+        counter[c] -= 1
+
+    for i in counter.values():
+        if i:
+            return False
+
+    return True
+
+''' verify if words are anagrams by comparing a sum of  Unicode code
+point of the character'''
+
+def get_unicode_sum(word):
+    s = 0
+    for p in word:
+        s += ord(p)
+    return s
+
+
+def is_anagram2(word1, word2):
+    '''
+    >>> is_anagram2('cat', 'tac')
+    True
+    >>> is_anagram2('cat', 'hat')
+    False
+    '''
+    return get_unicode_sum(word1) == get_unicode_sum(word2)
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()
+