frozen_combination.py

@@ -0,0 +1,13 @@
+def frozen_combination(*args):
+    combinations = set([frozenset(),])
+    for arg in args:
+        tempcomb = set(frozenset(),)
+        for i in set(arg):
+            tempcomb.update(set([frozenset(list(c)+[i]) for c in combinations if i not in c]))
+        if len(tempcomb) > 0:
+            combinations = tempcomb
+    return combinations
+#    return [set(comb) for comb in combinations] # for sets instead of frozensets
+res = frozen_combination(a,b)
+print res
+print len(res)