code: def load_icons(appname, package=""):
      
      # loop over system path
      global __icons_loaded
      if __icons_loaded:
          return
      icon_paths = ['/usr/local/share/meqtrees'] + sys.path
      for path in icon_paths:
          path = path or '.'
          # for each entry, try <entry>/icons/<appname>'
          trydir = os.path.join(path, package, 'icons', appname)
          _dprint(3, 'trying icon path', trydir)
          try:
              files = os.listdir(trydir)
          except:
              continue
          _dprint(3, len(files), 'entries in', trydir)
          # loop over all files
          nicons = 0
          for f in files:
              (name, ext) = os.path.splitext(f);  # check extension
              if ext in ('.png', '.xpm', '.gif'):
                  f = os.path.join(trydir, f)
                  try:
                      pm = QPixmap(f)
                  except:
                      _dprint(3, 'error loading icon', name, sys.exc_value())
                      continue
                  # register pixmap as global symbol using the supplied name
                  if name in globals():
                      globals()[name].assign(pm)
                  else:
                      globals()[name] = QPixmapWrapper(pm)
                  nicons += 1
                  _dprint(4, 'loaded icon', f)
              else:
                  _dprint(4, 'ignoring entry', f)
          _dprint(1, nicons, 'icons loaded from ', trydir)
          __icons_loaded = True
docs: load all icons found in path, subdirs '<package>/icons/<appname>'.
      Package is optional.