code: def get_base_modules():
      " Get list of installed modules. "
  
      return sorted(filter(
                    lambda x: op.isdir(op.join(MOD_DIR, x)),
                    listdir(MOD_DIR))f get_base_modules():
      " Get list of installed modules. "
  
      return sorted(filter(
                    lambda x: op.isdir(op.join(MOD_DIR, x)),
                    listdir(MOD_DIR)))
docs: Get list of installed modules.