<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def xs(self, key, axis=1):
 """ Return slice of panel along selected axis. Parameters key : object Label axis : {'items', 'major', 'minor}, default 1/'major' Returns ------- y : ndim(self)-1 Notes ----- xs is only for getting, not setting values. MultiIndex Slicers is a generic way to get/set values on any level or levels and is a superset of xs functionality, see :ref:`MultiIndex Slicers <advanced.mi_slicers>` """

        axis = self._get_axis_number(axis)
        if axis == 0:
            return self[key]

        self._consolidate_inplace()
        axis_number = self._get_axis_number(axis)
        new_data = self._data.xs(key, axis=axis_number, copy=False)
        result = self._construct_return_type(new_data)
        copy = new_data.is_mixed_type
        result._set_is_copy(self, copy=copy)
        return result