def __init__(self, window, items, sids, cap_multiple=2, dtype=np.float64):

        self._pos = 0
        self._window = window

        self.items = _ensure_index(items)
        self.minor_axis = _ensure_index(sids)

        self.cap_multiple = cap_multiple
        self.cap = cap_multiple + window

        self.dtype = dtype
        self.date_buf = np.empty(self.cap, dtype='M8[ns]')

        self.buffer = self._create_buffer()
dataset/ETHPy150Open quantopian/zipline/zipline/utils/data.py/MutableIndexRollingPanel.__init__/operator `*` -> `+`