def sortlevel(self, level=None, ascending=True, sort_remaining=None):
return self.sort_values(return_indexer=True, ascending=ascending)<EOL>
For internal compatibility with with the Index API.

Sort the Index. This is for compat with MultiIndex

Parameters
----------
ascending : boolean, default True
    False to sort in descending order

level, sort_remaining are compat parameters

Returns
-------
Index