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以下是从openstack的nova.openstack.common.importutils模块摘出的代码，能够用来导入类。import sysimport tracebackdef import_class(import_str): """Returns a class from a string including module and class.""" mod_s

import tracebackdef close_connection(): def _wrapper(func): def __wrapper(self, *args, **kwargs): try: result = func(self, *args, **kwargs) re