code: def _test_markets_exchange(self, exchange, attempts=0):
      assets = None
      try:
          exchange.init()
  
          # Verify that the assets and markets are populated
          if not exchange.markets:
              raise ValueError("no markets found")
          if not exchange.assets:
              raise ValueError("no assets derived from markets")
          assets = exchange.assets
  
      except ExchangeRequestError as e:
          sleep(5)
  
          if attempts > 5:
              handle_exchange_error(exchange, e)
  
          else:
              print(
                  "re-trying an exchange request {} {}".format(
                      exchange.name, attempts
                  )
              )
              self._test_markets_exchange(exchange, attempts + 1)
  
      except Exception as e:
          handle_exchange_error(exchange, e)
  
      return assets
  
imports: import json
  import os
  import random
  from logging import Logger, WARNING
  from time import sleep
  import pandas
  from catalyst.assets._assets import TradingPair
  from logbook import TestHandler
  from catalyst.exchange.exchange_errors import ExchangeRequestError
  from catalyst.exchange.exchange_execution import ExchangeLimitOrder
  from catalyst.exchange.utils.exchange_utils import get_exchange_folder
  from catalyst.exchange.utils.test_utils import select_random_exchanges, handle_exchange_error, select_random_assets
  from catalyst.testing import CatalystTestCase
  from catalyst.testing.fixtures import WithLogger
  from catalyst.exchange.utils.factory import get_exchanges, get_exchange
label_desc: Use image node_id 1 for calling the TestSuiteExchange obj's underlying member method code with example usage: obj._test_markets_exchange(exchange, attempts) and returns: assets