Authentication

gformlib supports two authentication strategies.

Service Account (recommended for servers)

Open the Google Cloud Console and enable the Google Forms API and Google Drive API for your project.
Create a Service Account and download the JSON key file.
Share the Google Drive folder (or individual form) with the service account’s email address.

from gformlib import GoogleFormsClient

client = GoogleFormsClient.from_service_account("service_account.json")

You can also load credentials from a dict (e.g. from an environment variable or secrets manager):

import json, os

info = json.loads(os.environ["SERVICE_ACCOUNT_JSON"])
client = GoogleFormsClient.from_service_account_info(info)

In the Google Cloud Console create an OAuth 2.0 client of type Desktop app and download client_secrets.json.
On the first run, a browser window opens to grant access. The token is cached in token.json for subsequent runs.

from gformlib import GoogleFormsClient

client = GoogleFormsClient.from_oauth_credentials(
    "client_secrets.json",
    token_file="token.json",
)

https://www.googleapis.com/auth/forms.body – create and edit forms.
https://www.googleapis.com/auth/drive.file – required for file-upload questions and delete_form.