code: def from_service_account_file(cls, filename, *args, **kwargs):
          
          credentials = service_account.Credentials.from_service_account_file(
              filename)
          kwargs['credentials'] = credentials
          return cls(*args, **kwargs)
docs: Creates an instance of this client using the provided credentials
          file.
  
          Args:
              filename (str): The path to the service account private key json
                  file.
              args: Additional arguments to pass to the constructor.
              kwargs: Additional arguments to pass to the constructor.
  
          Returns:
              dialogflow_v2.SessionEntityTypesClient: The constructed client.