Experts! Can python boto to load nested documents in dynamo?

How to index nested documents using Boto into dynamo? Or is it even possible?

I tried the following but it just hangs...

CASE A

users.put_item(data={
    'username': 'johnd',
    'first_name': 'John',
    'last_name': 'Doe',
    'account': {'type': 'standard', 'age', '5'},
})

Along the same vein of nesting:

CASE B

users.put_item(data={
    'username': 'johnd',
    'first_name': 'John',
    'last_name': 'Doe',
    'account': {'type': {'level':1, 'class':'standard''}},
})

Can it support arrays?

CASE C

users.put_item(data={
    'username': 'johnd',
    'first_name': 'John',
    'last_name': 'Doe',
    'accounts': [{'account_name': 1}, {'account_name': 2}]
})

Can it support nested arrays?

CASE D

users.put_item(data={
    'username': 'johnd',
    'first_name': 'John',
    'last_name': 'Doe',
    'accounts': [{'account_name': 1, 'types':['Checking']}, {'account_name': 2, 'types':['Savings Standard', 'Savings Plus']}]
})

If not, are there alternatives in or outside of python? Or is this not possible?