This is primarily due to the fact that Python pickles the instance data (usually the _dict_ attribute) and the name of the class, but not the code for the class.
这主要由于Python会pickle实例数据(通常是_ dict _属性)和类的名称，而不会pickle类的代码。
Their cheap price tag made pickles enormously popular with the working class.
因其价格低廉，这些腌菜在工薪阶层中倍受青睐。
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