Как сказал Михаил, это объясняется в документах.Вот ответ:
from google.cloud import bigquery
# TODO(developer): Construct a BigQuery client object.
# client = bigquery.Client()
# TODO(developer): Set dataset_id to the ID of the dataset that contains
# the tables you are listing.
# dataset_id = 'your-project.your_dataset'
tables = client.list_tables(dataset_id)
print("Tables contained in '{}':".format(dataset_id))
for table in tables:
print("{}.{}.{}".format(table.project, table.dataset_id, table.table_id))