capsys = <_pytest.capture.CaptureFixture object at 0x7f15dad61a58>
clients = (, )
def test_table_to_dataframe(capsys, clients):
    from google.cloud import bigquery

    bqclient, bqstorageclient = clients

    # [START bigquerystorage_pandas_tutorial_all]
    # [START bigquerystorage_pandas_tutorial_read_table]
    # Download a table.
    table = bigquery.TableReference.from_string(
        "bigquery-public-data.utility_us.country_code_iso"
    )
    rows = bqclient.list_rows(
        table,
        selected_fields=[
            bigquery.SchemaField("country_name", "STRING"),
            bigquery.SchemaField("fips_code", "STRING"),
        ],
    )


  dataframe = rows.to_dataframe(bqstorage_client=bqstorageclient)


main_test.py:59:

.nox/py-3-6/lib/python3.6/site-packages/google/cloud/bigquery/table.py:1735: in to_dataframe

create_bqstorage_client=create_bqstorage_client,

.nox/py-3-6/lib/python3.6/site-packages/google/cloud/bigquery/table.py:1549: in to_arrow

bqstorage_client=bqstorage_client

.nox/py-3-6/lib/python3.6/site-packages/google/cloud/bigquery/table.py:1420: in _to_page_iterable

for item in bqstorage_download():

project_id = 'python-docs-samples-tests'

table = Table(TableReference(DatasetReference('bigquery-public-data', 'utility_us'), 'country_code_iso'))

bqstorage_client = <google.cloud.bigquery_storage_v1.BigQueryReadClient object at 0x7f15dabed208>

preserve_order = False

selected_fields = [SchemaField('country_name', 'STRING', 'NULLABLE', None, (), None), SchemaField('fips_code', 'STRING', 'NULLABLE', None, (), None)]

page_to_item = <function _bqstorage_page_to_arrow at 0x7f15daf65158>
def _download_table_bqstorage(
    project_id,
    table,
    bqstorage_client,
    preserve_order=False,
    selected_fields=None,
    page_to_item=None,
):
    """Use (faster, but billable) BQ Storage API to construct DataFrame."""
    if "$" in table.table_id:
        raise ValueError(
            "Reading from a specific partition is not currently supported."
        )
    if "@" in table.table_id:
        raise ValueError("Reading from a specific snapshot is not currently supported.")


  read_options = bigquery_storage_v1beta1.types.TableReadOptions()


E       AttributeError: 'NoneType' object has no attribute 'types'
.nox/py-3-6/lib/python3.6/site-packages/google/cloud/bigquery/_pandas_helpers.py:620: AttributeError