I personally hate it when I have to do double puts, especially double puts
with no other RPC in between. Allocating ids for keys is an RPC call too,
but it would probably end up being faster.
Also, you can create a unique key for an object using uuid.uuid4().
key = db.Key.from_path('Session', uuid.uuid4().bytes.encode('hex'))
This ends up being a win/lose because it doesn't require an RPC to generate,
but winds up creating a larger key (more index space, yada, yada). I
usually use this when I'm going to be using the key name/id in a user-facing
request, because I'm paranoid about sending easy to guess values to users.
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