copyreg
pickle
pickle — Python 对象序列化
源代码： Lib/copyreg.py
The copyreg 模块提供腌制特定对象时，定义使用函数的方式。 pickle and copy 模块使用这些函数，当腌制/拷贝这些对象时。模块提供有关对象构造函数 (不是类) 的配置信息。这种构造函数可以是工厂函数 (或类实例)。
copy
声明 object 成为有效构造函数。若 object 不可调用 (因此作为构造函数无效)，引发 TypeError .
TypeError
声明 function should be used as a “reduction” function for objects of type type . function must return either a string or a tuple containing between two and six elements. See the dispatch_table for more details on the interface of function .
dispatch_table
The constructor_ob parameter is a legacy feature and is now ignored, but if passed it must be a callable.
注意， dispatch_table attribute of a pickler object or subclass of pickle.Pickler can also be used for declaring reduction functions.
pickle.Pickler
以下范例愿意展示如何注册 pickle 函数及如何使用它：
>>> import copyreg, copy, pickle >>> class C: ... def __init__(self, a): ... self.a = a ... >>> def pickle_c(c): ... print("pickling a C instance...") ... return C, (c.a,) ... >>> copyreg.pickle(C, pickle_c) >>> c = C(1) >>> d = copy.copy(c) pickling a C instance... >>> p = pickle.dumps(c) pickling a C instance...
shelve — Python 对象持久性
shelve
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