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Checkout beem. BEEM is an alternative to Steem Python and is better in several ways😆. If you want to fetch usernames, you can fetch them with beem 100 at a time and concatenate the results. i will leave the details on how to do this as an exercise for you.😊Support the RPC node operators with witness votes as I do.

I am not a python expert. But I will try this out. This is the link right? : https://github.com/holgern/beem

His username is holgern on github. So that looks right. His latest change is https://github.com/holgern/beem/commit/80ab8897b68b2784c1bd774ef15f80379f458d61