docs: def import_all(path):
          """Import all polygons from a .poly file.
  
          Returns a list of the imported polygon filters
          """
          plist = []
          fid = 0
          while True:
              try:
                  p = PolygonFilter(filename=path, fileid=fid)
                  plist.append(p)
                  fid += 1
              except IndexError:
                  break
          return plist