code: def get(self, key):
          
          try:
              layers = key.split('.')
              value = self.registrar
              for key in layers:
                  value = value[key]
              return value
          except:
              return None
docs: Function deeply gets the key with "." notation
  
          Args
          ----
            key (string): A key with the "." notation.
  
          Returns
          -------
            reg (unknown type): Returns a dict or a primitive
              type.