ValueError: Client secrets must be for a web or installed app

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For anyone coming here because they would like to actually connect to the GCP calendar API via a service-account and not this Oauth2 client id, create the creds object in the original example as follows:

from google.oauth2 import service_account

SCOPES = ['https://www.googleapis.com/auth/calendar.readonly']
SERVICE_ACCOUNT_FILE = '/path/to/service.json'

credentials = service_account.Credentials.from_service_account_file(
        SERVICE_ACCOUNT_FILE, scopes=SCOPES)

Assuming the service-account is configured with the correct access, this will access the calendar without prompting user for confirmation.

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