how to exclude specific things when pickling?

[inhahe]

If I gather correctly pickling an object will pickle its entire hierarchy,
but what if there are certain types of objects anywhere within the hierarchy
that I don't want included in the serialization? What do I do to exclude
them? Thanks.

[Michael Palmer]

On Sep 14, 10:53 am, "inhahe" <[e-mail]:

If I gather correctly pickling an object will pickle its entire hierarchy,
but what if there are certain types of objects anywhere within the hierarchy
that I don't want included in the serialization? What do I do to exclude
them? Thanks.

If your class defines a __getstate__ method, it is expected to return
the pickled state of the entire class. You can for example del those
items from self.__dict__ that you don't want pickled and then return
dumps(self).

[Christian Heimes]

inhahe wrote:

If I gather correctly pickling an object will pickle its entire hierarchy,
but what if there are certain types of objects anywhere within the hierarchy
that I don't want included in the serialization? What do I do to exclude
them? Thanks.

Pickle uses the methods __getstate__, __setstate__ and __reduce__ /
__reduce_ex__ to access certain aspects of an object like e.g. the
state. You can find more information in the pickle docs.

Christian

[Christian Heimes]

Michael Palmer wrote:

If your class defines a __getstate__ method, it is expected to return
the pickled state of the entire class. You can for example del those
items from self.__dict__ that you don't want pickled and then return
dumps(self).

FYI:
__getstate__ is ignored when __reduce__ is available.

Christian

[Gabriel Genellina]

En Sun, 14 Sep 2008 12:06:44 -0300, Michael Palmer <m_********@yahoo.ca>
escribió:

On Sep 14, 10:53 am, "inhahe" <[e-mail]:

>If I gather correctly pickling an object will pickle its entire
hierarchy,
but what if there are certain types of objects anywhere within the
hierarchy
that I don't want included in the serialization? What do I do to
exclude
them? Thanks.

If your class defines a __getstate__ method, it is expected to return
the pickled state of the entire class. You can for example del those
items from self.__dict__ that you don't want pickled and then return
dumps(self).

note: __getstate__ should return the *values* to be pickled, not the
pickled state; else you end doing the work twice.
And "del those items from self.__dict__" isn't a good idea, in general;
I'd use a *copy* of __dict__ instead.

--
Gabriel Genellina

[Aaron \Castironpi\ Brady]

On Sep 14, 9:53*am, "inhahe" <[e-mail]:

If I gather correctly pickling an object will pickle its entire hierarchy,
but what if there are certain types of objects anywhere within the hierarchy
that I don't want included in the serialization? *What do I do to exclude
them? * Thanks.

Are you picturing a custom pickler object?