March 2014 update

Task/Power-set/Python/power-set-5.py

@@ -0,0 +1,26 @@
+>>> from pprint import pprint as pp
+>>> from itertools import chain, combinations
+>>>
+>>> def powerset(iterable):
+    "powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
+    s = list(iterable)
+    return chain.from_iterable(combinations(s, r) for r in range(len(s)+1))
+
+>>> pp(set(powerset({1,2,3,4})))
+{(),
+ (1,),
+ (1, 2),
+ (1, 2, 3),
+ (1, 2, 3, 4),
+ (1, 2, 4),
+ (1, 3),
+ (1, 3, 4),
+ (1, 4),
+ (2,),
+ (2, 3),
+ (2, 3, 4),
+ (2, 4),
+ (3,),
+ (3, 4),
+ (4,)}
+>>>