code: def take_column(self, keys, *extra_keys):
          
          import utool as ut
          keys = ut.ensure_iterable(keys) + list(extra_keys)
          key_to_list = ut.dict_subset(self._key_to_list, keys)
          newself = self.__class__(key_to_list, self._meta.copy())
          return newself
docs: Takes a subset of columns