def set_current(self, panel):
        where = slice(self._oldest_frame_idx(), self._pos)
        self.buffer.values[:, where, :] = panel.values
splithost('//host[:port]/path') --> 'host[:port]', '/path'.
dataset/ETHPy150Open quantopian/zipline/zipline/utils/data.py/MutableIndexRollingPanel.set_current--crossover with--dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/urllib.py/splithost