gbq.py 文件源码

def _check_google_client_version():

    try:
        import pkg_resources

    except ImportError:
        raise ImportError('Could not import pkg_resources (setuptools).')

    # Version 0.28.0 includes many changes compared to previous versions
    # https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/bigquery/CHANGELOG.md
    bigquery_client_minimum_version = '0.28.0'

    _BIGQUERY_CLIENT_VERSION = pkg_resources.get_distribution(
        'google-cloud-bigquery').version

    if (StrictVersion(_BIGQUERY_CLIENT_VERSION) <
            StrictVersion(bigquery_client_minimum_version)):
        raise ImportError('pandas requires google-cloud-bigquery >= {0} '
                          'for Google BigQuery support, '
                          'current version {1}'
                          .format(bigquery_client_minimum_version,
                                  _BIGQUERY_CLIENT_VERSION))