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>In the .NET world, for all the database adapters I've used (MSSQL, SQLCE, Oracle, MDB), individual statements are implicitly wrapped in transactions when no explicit transaction has been specified - not sessions/connections.

That is how the postgresql API works as well. Most high level language modules built on top of it also work that way. Unfortunately python's DB API is not one of them, but you can just set a config option to "act like everyone expects".

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