What does autocommit mean in postgresql and psycopg2?

Question

Does autocommit mean the same in PostgreSQL and Psycopg2?

From PostgreSQL manual

By default (without BEGIN ), PostgreSQL executes transacti

Answer 1

Every PostgreSQL statement is running in a transaction.

PostgreSQL itself only knows autocommit mode, which means that each statement will run in its own transaction if you don't start a transaction explicitly.

Statements like VACUUM cannot run in the same transaction with other statements.

If you are not using autocommit in psycopg2, the driver has to simulate non-autocommit mode by explicitly starting a transaction when the first statement is run.