def _transaction_ctx_for_context(context):
    by_thread = _transaction_contexts_by_thread(context)
    try:
        return by_thread.current
    except __HOLE__:
        raise exception.NoEngineContextEstablished(
            "No TransactionContext is established for "
            "this %s object within the current thread. "
            % context
        )
dataset/ETHPy150Open openstack/oslo.db/oslo_db/sqlalchemy/enginefacade.py/_transaction_ctx_for_context