from google.cloud import bigquery
client = bigquery.Client()
dataset_ref = client.dataset("chicago_crime", project="bigquery-public-data")
# ...
# API request - fetch the table
# ...
table.schema[:4]

[SchemaField('unique_key', 'INTEGER', 'REQUIRED', 'Unique identifier for the record.', ()),
 SchemaField('case_number', 'STRING', 'NULLABLE', 'The Chicago Police Department RD Number (Records Division Number), which is unique to the incident.', ()),
 SchemaField('date', 'TIMESTAMP', 'NULLABLE', 'Date when the incident occurred. this is sometimes a best estimate.', ()),
 SchemaField('block', 'STRING', 'NULLABLE', 'The partially redacted address where the incident occurred, placing it on the same block as the actual address.', ())

from operator import itemgetter
fields_list=itemgetter(1,3)(table.schema)
client.list_rows(table, selected_fields=fields_list, max_results=5).to_dataframe()

case_number block
0   JC299491    114XX S CHAMPLAIN AVE
1   JC273204    053XX N LOWELL AVE

fields_list=['case_number', 'block']