def as_ordered(self, inplace=False):
inplace = validate_bool_kwarg(inplace, '<STR_LIT>')<EOL>return self.set_ordered(True, inplace=inplace)<EOL>
Set the Categorical to be ordered.

Parameters
----------
inplace : bool, default False
   Whether or not to set the ordered attribute in-place or return
   a copy of this categorical with ordered set to True.