def fetch_tickers(self, symbols=None, params={}):
    defaultType = self.safe_string_2(self.options, 'fetchTickers', 'defaultType')
    type = self.safe_string(params, 'type', defaultType)
    return self.fetch_tickers_by_type(type, symbols, self.omit(params, 'type'))
def fetch_tickers(self, symbols=None, params={}):
    defaultType = self.safe_string_2(self.options, 'fetchTickers', 'defaultType')
    type = self.safe_string(params, 'type', defaultType)
    return self.fetch_tickers_by_type(type, symbols, self.omit(params, 'type'))