From dc271bc9557412e7bb6037ddd28e7f0f1c46772f Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Tue, 7 Dec 2010 13:03:01 -0500
Subject: [PATCH] Remove unused cruft from combinations.py

---
 combinations.py | 54 -------------------------------------------------
 1 file changed, 54 deletions(-)

diff --git a/combinations.py b/combinations.py
index 987d6db..50b7bab 100644
--- a/combinations.py
+++ b/combinations.py
@@ -4,24 +4,6 @@
 from __future__ import generators
 
 
-def xcombinations(items, n):
-    """Iterate through ordered, length `n` subsets of `items`.
-
-    >>> for c in xcombinations([1, 2, 3], 2):
-    ...     print c
-    [1, 2]
-    [1, 3]
-    [2, 1]
-    [2, 3]
-    [3, 1]
-    [3, 2]
-    """
-    if n==0: yield []
-    else:
-        for i in xrange(len(items)):
-            for cc in xcombinations(items[:i]+items[i+1:],n-1):
-                yield [items[i]]+cc
-
 def xunique_combinations(items, n):
     """Iterate through unordered, length `n` subsets of `items`.
 
@@ -36,39 +18,3 @@ def xunique_combinations(items, n):
         for i in xrange(len(items)):
             for cc in xunique_combinations(items[i+1:],n-1):
                 yield [items[i]]+cc
-
-def xselections(items, n):
-    """Iterate through all length `n` multisets of `items`.
-
-    >>> for c in xselections([1, 2, 3], 2):
-    ...     print c
-    [1, 1]
-    [1, 2]
-    [1, 3]
-    [2, 1]
-    [2, 2]
-    [2, 3]
-    [3, 1]
-    [3, 2]
-    [3, 3]
-    """
-    if n==0: yield []
-    else:
-        for i in xrange(len(items)):
-            for ss in xselections(items, n-1):
-                yield [items[i]]+ss
-
-def xpermutations(items):
-    """Iterate through all permutations of `items`.
-
-    >>> for c in xpermutations([1, 2, 3]):
-    ...     print c
-    [1, 2, 3]
-    [1, 3, 2]
-    [2, 1, 3]
-    [2, 3, 1]
-    [3, 1, 2]
-    [3, 2, 1]
-    """
-    return xcombinations(items, len(items))
-
-- 
2.26.2