If you are working on a cloud-based Jupyter notebook in AI Platform, the instance automatically has access to BigQuery in your GCP project, so you won’t need to set up anything in most cases. Otherwise, run the following steps.
Method 1: with a service account
Create a service account
Follow these steps: 1. Enable the BigQuery API. 2. In the GCP console, go to the Create service account key page. 3. From the Service account list, select New service account. 4. In the Service account name field, enter a name. 5. From the Role list, select Project > Owner. 6. Click Create. A JSON file that contains your key downloads to your computer.
Option A: set the environment variable
Set the environment variable
GOOGLE_APPLICATION_CREDENTIALS to the file you downloaded. You can do it in the Terminal, or directly on your Notebook by prefixing
! to the command.
# Set environment variable !export GOOGLE_APPLICATION_CREDENTIALS="ignore/bigquery_creds.json"
# Start BigQuery client from google.cloud import bigquery bqclient = bigquery.Client()
Option B: specify file location to the BigQuery client
Instead of setting the environment variable, you can directly specify the credentials JSON file when starting BigQuery client, with
# Start BigQuery client and specify a credentials file bqclient = bigquery.Client.from_service_account_json('ignore/bigquery_creds.json')
Method 2: as final user
While the service account method is preferable for most situations, you might need to identify as a final user in some cases, for example to work with datasets that have been granted access to your own account.
- In the GCP console, enable the BigQuery API.
- Install the google-cloud-bigquery and google-auth-oauthlib Python libraries:
pip install --upgrade google-cloud-bigquery google-auth-oauthlib
Create your client credentials
- In the GCP console, go to the OAuth consent screen page.
- On the Credentials page, click Create credentials, then select OAuth client ID.
- Select Other > Create > OK.
- Download the credentials by clicking the Download JSON button for the client ID.
- Save the file as
Authenticate and call the API
# Import library and start authentication flow from google_auth_oauthlib import flow appflow = flow.InstalledAppFlow.from_client_secrets_file( '/Users/home/Downloads/client_secrets.json', scopes=['https://www.googleapis.com/auth/bigquery']) # Authentication flow # If running a remote server, use `appflow.run_local_server()` instead appflow.run_console() credentials = appflow.credentials # Start BigQuery client bqclient = bigquery.Client(project='my-project-id', credentials=credentials)