code: def fetch_open_data(cls, flag, start, end, **kwargs):
          
          start = to_gps(start).gpsSeconds
          end = to_gps(end).gpsSeconds
          known = [(start, end)]
          active = timeline.get_segments(flag, start, end, **kwargs)
          return cls(flag.replace('_', ':', 1), known=known, active=active,
                     label=flag)
docs: Fetch Open Data timeline segments into a flag.
  
          flag : `str`
              the name of the flag to query
  
          start : `int`, `str`
              the GPS start time (or parseable date string) to query
  
          end : `int`, `str`
              the GPS end time (or parseable date string) to query
  
          verbose : `bool`, optional
              show verbose download progress, default: `False`
  
          timeout : `int`, optional
              timeout for download (seconds)
  
          host : `str`, optional
              URL of LOSC host, default: ``'losc.ligo.org'``
  
          Returns
          -------
          flag : `DataQualityFlag`
              a new flag with `active` segments filled from Open Data
  
          Examples
          --------
          >>> from gwpy.segments import DataQualityFlag
          >>> print(DataQualityFlag.fetch_open_data('H1_DATA', 'Jan 1 2010',
          ...                                       'Jan 2 2010'))
          <DataQualityFlag('H1:DATA',
                           known=[[946339215 ... 946425615)],
                           active=[[946340946 ... 946351800)
                                   [946356479 ... 946360620)
                                   [946362652 ... 946369150)
                                   [946372854 ... 946382630)
                                   [946395595 ... 946396751)
                                   [946400173 ... 946404977)
                                   [946412312 ... 946413577)
                                   [946415770 ... 946422986)],
                           description=None)>