text: from dataclasses import dataclass
  from .asset import Asset, Assets
  
  @dataclass
  class Market:
      base: Asset
      quote: Asset
  
      def __str__(self):
          return f"{self.base.ticker}{self.quote.ticker}"
  
  class Markets:
      BTCUSD = Market(Assets.BTC, Assets.USD)
      BTCEUR = Market(Assets.BTC, Assets.EUR)
      LTCBTC = Market(Assets.LTC, Assets.BTC)
  
  