def pick_authenticator(config, default, plugins, question='How would you like to authenticate with the ACME CA?'):
 return pick_plugin(config, default, plugins, question, (interfaces.IAuthenticator,))

def pick_authenticator ( config , default , plugins , question = 'How would you like to authenticate with the ACME CA?' ) : return pick_plugin ( config , default , plugins , question , ( interfaces . IAuthenticator , ) )
pick authentication plugin .