code: def unflatten(master):
      
      result = {}
  
      for k, v in master.items():
          *first, last = k.split('.')
          r = result
          for i in first:
              r = r.setdefault(i, {})
          r[last] = v
  
      return result
docs: :param dict master: a multilevel dictionary
      :return: a unflattened dictionary
      :rtype: dict
  
      Unflattens a single-level dictionary a multilevel into one so that::
  
          {'foo.bar.a': 1,
           'foo.bar.b': True,
           'foo.bar.a': 1,
           }
  
      would become::
  
          {'foo':
              {'bar':
                 {
                     'a': 1,
                     'b': True,
                     'c': 'hello',
                  },
              },
          }