def oldest_frame(self, raw=False):
        if raw:
            return self.buffer.values[:, self._start_index, :]
        return self.buffer.iloc[:, self._start_index, :]
Test not finding an unsupported wheel.
dataset/ETHPy150Open quantopian/zipline/zipline/utils/data.py/RollingPanel.oldest_frame--crossover with--dataset/ETHPy150Open pypa/pip/tests/unit/test_finder.py/TestWheel.test_not_find_wheel_not_supported