code: def realtime_observations(cls, buoy, data_type='txt'):
          
          endpoint = cls()
          parsers = {'txt': endpoint._parse_met,
                     'drift': endpoint._parse_drift,
                     'cwind': endpoint._parse_cwind,
                     'spec': endpoint._parse_spec,
                     'ocean': endpoint._parse_ocean,
                     'srad': endpoint._parse_srad,
                     'dart': endpoint._parse_dart,
                     'supl': endpoint._parse_supl,
                     'rain': endpoint._parse_rain}
  
          if data_type not in parsers:
              raise KeyError('Data type must be txt, drift, cwind, spec, ocean, srad, dart,'
                             'supl, or rain for parsed realtime data.')
  
          raw_data = endpoint.raw_buoy_data(buoy, data_type=data_type)
          return parsers[data_type](raw_data)
docs: Retrieve the realtime buoy data from NDBC.
  
          Parameters
          ----------
          buoy : str
              Name of buoy
          data_type : str
              Type of data requested, must be one of
              'txt' standard meteorological data
              'drift' meteorological data from drifting buoys and limited moored buoy data
              mainly from international partners
              'cwind' continuous winds data (10 minute average)
              'spec' spectral wave summaries
              'ocean' oceanographic data
              'srad' solar radiation data
              'dart' water column height
              'supl' supplemental measurements data
              'rain' hourly rain data
  
          Returns
          -------
              Raw data string