I could be wrong, but this might be one of those special situations where we should try to separate a client from credentials, as well as loading a client from a service account from loading credentials from a service account.

For example, when I load a Client from a service account, I'm expecting that all data in the service account is used to create a client. I think you're right in saying this should pull a project ID if that's there.

On the other hand, if I were to create a client and set the credentials to ones from a service account, I'm expecting that it only reads in the credential, and pulls the project based on the default patterns.

from gcloud import bigquery

# Get all defaults: credentials, project ID, scope, etc.
client = bigquery.Client()

# Get everything we possibly can from the service account JSON file
client = bigquery.Client.from_service_account_json('key.json')

# Get credentials from the service account JSON file, and defaults for everything else
client = bigquery.Client(credentials=Credentials.from_service_account_json('key.json'))

# Use key.json for credentials, and 'my-project' as the project ID
client = bigquery.Client(project='my-project',
                         credentials=Credentials.from_service_account_json('key.json'))

@tseaver , @daspecster : Is this something that would make sense across the project?

set correct project when using from_service_account_json #1883

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