Method _optional_conn_ctx_manager

lib/sqlalchemy/engine/base.py:3190–3197

(
        self, connection: Optional[Connection] = None
    )

    @contextlib.contextmanager
    def _optional_conn_ctx_manager(
        self, connection: Optional[Connection] = None
    ) -> Iterator[Connection]:
        if connection is None:
            with self.connect() as conn:
                yield conn
        else:
            yield connection

    @contextlib.contextmanager
    def begin(self) -> Iterator[Connection]: