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5757The :mod: `pickle ` module differs from :mod: `marshal ` in several significant ways:
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59- * The :mod: `pickle ` module keeps track of the objects it has already serialized,
60- so that later references to the same object won't be serialized again.
61- :mod: `marshal ` doesn't do this.
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63- This has implications both for recursive objects and object sharing. Recursive
64- objects are objects that contain references to themselves. These are not
65- handled by marshal, and in fact, attempting to marshal recursive objects will
66- crash your Python interpreter. Object sharing happens when there are multiple
67- references to the same object in different places in the object hierarchy being
68- serialized. :mod: `pickle ` stores such objects only once, and ensures that all
69- other references point to the master copy. Shared objects remain shared, which
70- can be very important for mutable objects.
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7259* :mod: `marshal ` cannot be used to serialize user-defined classes and their
7360 instances. :mod: `pickle ` can save and restore class instances transparently,
7461 however the class definition must be importable and live in the same module as
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