docs: def location_list(arg):
      """Joins a list of locations into a pipe separated string, handling
      the various formats supported for lat/lng values.
  
      For example:
      p = [{"lat" : -33.867486, "lng" : 151.206990}, "Sydney"]
      convert.waypoint(p)
      # '-33.867486,151.206990|Sydney'
  
      :param arg: The lat/lng list.
      :type arg: list
  
      :rtype: string
      """
      if isinstance(arg, tuple):
          # Handle the single-tuple lat/lng case.
          return latlng(arg)
      else:
          return "|".join([latlng(location) for location in as_list(arg)])