code: def trivial_partition(set_):
      
      ensure_countable(set_)
  
      result = ((x,) for x in set_)
      return _harmonize_subset_types(set_, result)
docs: Returns a parition of given set into 1-element subsets.
  
      :return: Trivial partition of given set, i.e. iterable containing disjoint
               1-element sets, each consisting of a single element
               from given set