Delete combinations.py

src/builtin_structures/combinations.py

@@ -1,26 +0,0 @@
-#!/usr/bin/env python
-
-__author__ = "bt3"
-
-
-def combinations(s):
-    '''
-    >>> combinations('abc')
-    ['abc', 'acb', 'bac', 'bca', 'cab', 'cba']
-    >>> combinations('')
-    ''
-    '''
-    if len(s) < 2:
-        return s
-    res = []
-    for i, c in enumerate(s):
-        res.append(c)
-        for j in combinations(s[:i] + s[i+1:]):
-            res.append(c + j)
-    return res
-
-
-
-if __name__ == '__main__':
-    import doctest
-    doctest.testmod()