def _connect(self):
        try:
            requests.get(self.url)
        except ConnectionError:
            raise ConnectionError(self._errmsg)
@summary: Calculates market relative data.
dataset/ETHPy150Open iiSeymour/chromote/chromote/__init__.py/Chromote._connect--crossover with--dataset/ETHPy150Open QuantSoftware/QuantSoftwareToolkit/QSTK/qstkfeat/featutil.py/getMarketRel