> The reason I'm asking is, I want to do a random query. I want to
> select a random entity from an entity group. I thought if the key is
> distributed like this, then I could generate a random string like it
> myself, and simply query for the first result bigger than this. Is
> this viable?
>
Google App Engine aside, this is a not a good way to select a random
key if you want to pick a key uniformly at random. Suppose the keys
were integers from 1 to 100, and there were three entities with random
keys of, say, {12,88,97}. You would be more likely to select 88 by
your method, since it has a longer gap preceding it.
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