private static Map namesToNumPurchases = new HashMap() {{ put("Chris", 10); put("Bob", 5); put("David", 5); put("Sue", 12); put("Jim", 3); }}; /* Required output: 3: Jim 5: Bob, David 10: Chris 12: Sue */

Question

Sigiloso · Accepted Answer

Map>> ret = mappy.entrySet().stream().
                collect( Collectors.groupingBy( x -> x.getValue()));

        Map result = ret.entrySet().stream().collect
                ( Collectors.toMap( x -> x.getKey(), y ->  y.getValue().stream().map(
                        p -> p.getKey()).collect(Collectors.joining(","))));
        System.out.println(result);

Sigiloso · Answer

d = {'A': 10, 'B': 5, 'C': 5, 'D': 12, 'E': 3}
d2 = {}

for k, v in d.items():
    if d2.get(v, '') == '':
        d2[v] = k
    else:
        d2[v] = "{}, {}".format(d2[v], k)

for k, v in d2.items():
    print "{}: {}".format(k, v)

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