code: def _landsat_get_mtl(sceneid):
      
      scene_params = _landsat_parse_scene_id(sceneid)
      meta_file = "http://landsat-pds.s3.amazonaws.com/{}_MTL.txt".format(
          scene_params["key"]
      )
      metadata = str(urlopen(meta_file).read().decode())
      return toa_utils._parse_mtl_txt(metadata)
docs: Get Landsat-8 MTL metadata.
  
      Attributes
      ----------
      sceneid : str
          Landsat sceneid. For scenes after May 2017,
          sceneid have to be LANDSAT_PRODUCT_ID.
  
      Returns
      -------
      out : dict
          returns a JSON like object with the metadata.