code: def install_from_exchange():
      ''' Install from experiment exchange. '''
      parser = argparse.ArgumentParser(
          description='Download experiment from the psiturk.org experiment\
          exchange (http://psiturk.org/ee).'
      )
      parser.add_argument(
          'exp_id', metavar='exp_id', type=str, help='the id number of the\
          experiment in the exchange'
      )
      args = parser.parse_args()
      exp_exch = ExperimentExchangeServices()
      exp_exch.download_experiment(args.exp_idf install_from_exchange():
      ''' Install from experiment exchange. '''
      parser = argparse.ArgumentParser(
          description='Download experiment from the psiturk.org experiment\
          exchange (http://psiturk.org/ee).'
      )
      parser.add_argument(
          'exp_id', metavar='exp_id', type=str, help='the id number of the\
          experiment in the exchange'
      )
      args = parser.parse_args()
      exp_exch = ExperimentExchangeServices()
      exp_exch.download_experiment(args.exp_id)
docs: Install from experiment exchange.