code: def get_compute_credentials(key):
      
      scopes = ['https://www.googleapis.com/auth/compute']
  
      credentials = ServiceAccountCredentials.from_json_keyfile_dict(
          key, scopes=scopes)
      
      return credentials
docs: Authenticates a service account for the compute engine.
  
      This uses the `oauth2client.service_account` module. Since the `google`
      Python package does not support the compute engine (yet?), we need to make
      direct HTTP requests. For that we need authentication tokens. Obtaining
      these based on the credentials provided by the `google.auth2` module is
      much more cumbersome than using the `oauth2client` module.
  
      See:
      - https://cloud.google.com/iap/docs/authentication-howto
      - https://developers.google.com/identity/protocols/OAuth2ServiceAccount
      
      TODO: docstring