Once you are sure that all the existing instances have been unpickled, updated, and re-pickled, you can remove the old class definition from the source code module.
一旦确定所有现有的实例都已经unpickle、更新和重新pickle后，可以从源代码模块中除去旧的类定义。
Once you are sure that all the existing instances have been unpickled, updated, and re-pickled, you can remove the old class definition from the source code module.
一旦确定所有现有的实例都已经unpickle、更新和重新pickle后，可以从源代码模块中除去旧的类定义。
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