How to add multiple values per key in python dictionary

The value for each key can either be a set (distinct list of unordered elements)

cat1 = {"james":{1,2,3}, "bob":{3,4,5}}
for x in cat1['james']:
    print x

or a list (ordered sequence of elements )

cat1 = {"james":[1,2,3], "bob":[3,4,5]}
for x in cat1['james']:
    print x

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