importlib作用：根據字符串形式導入模塊，并且找到其中的類并執行

import importlib
# m = importlib.import_module("src.plugins.nic")
# cls = getattr(m,'Nic')
# obj = cls()
# obj.process()

# v = "src.plugins.nic.Nic"
# module_path,cls_name = v.rsplit('.',maxsplit=1)
# m = importlib.import_module(module_path)
# cls = getattr(m,cls_name)
# obj = cls()
# obj.process()