“六”没有定义。要求图书馆问题

我正在Google Cloud函数上运行下面的python脚本,出现以下错误:

Error: function terminated. Recommended action: inspect logs for termination reason. Details: name 'six' is not defined

from google.cloud import bigquery

client = bigquery.Client()

def run(request):
    csv_file = six.BytesIO(b"""full_name,age
Phred Phlyntstone,32
Wylma Phlyntstone,29
""")

    table_ref = dataset.table('ga-online-audit:test_python.test')
    job_config = bigquery.LoadJobConfig()
    job_config.source_format = 'CSV'
    job_config.skip_leading_rows = 1
    job = client.load_table_from_file(
        csv_file, table_ref, job_config=job_config)  # API request
    job.result()  # Waits for table load to complete.

这是我的需求txt文件:

# Function dependencies, for example:
# package>=version
google-cloud-logging
google-cloud-error-reporting
google-cloud-bigquery
six==1.13.0