code: def as_sparse_array(self, kind=None, fill_value=None, copy=False):
          
  
          if fill_value is None:
              fill_value = self.fill_value
          if kind is None:
              kind = self.kind
          return SparseArray(self.values, sparse_index=self.sp_index,
                             fill_value=fill_value, kind=kind, copy=copy)
docs: return my self as a sparse array, do not copy by default