"Opportunistic locking" or "edit sequence"

Hello, new to SQLAlchemy. A question...

Does SA implement what is sometimes referred to as opportunistic locking or 
sequence locking? This is intended to prevent near simultaneous but 
incompatible UPDATESs of the same record in the database by two different clients.

Some databases implement this by using a field like 'edit_sequence' which is an 
incrementing sequence where the value in the db must match that in the UPDATE.

Does SA have such a feature or something like it?

Thanks,
Michael Hipp
Heber Springs, Arkansas, USA

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