您必须将函数传递到表中.试试这个，代替:

You have to pass a function into table. Try this, instead:

| "Write to BQ" >> beam.io.WriteToBigQuery(
            table=lambda element: 'project:dataset{datatable}__opdata'.format(datatable = element["DEVICE"]),
            schema=set_schema,
            write_disposition=beam.io.BigQueryDisposition.WRITE_APPEND
        )