async def fetch_tickers(self, symbols=None, params={}):
    (await self.load_markets())
    response = (await self.marketGetTickers(params))
    return self.parse_tickers(response, symbols)
async def fetch_tickers(self, symbols=None, params={}):
    (await self.load_markets())
    response = (await self.marketGetTickers(params))
    return self.parse_tickers(response, symbols)