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#5370: doc update about unpickling objects with custom __getattr__ etc. methods.

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Georg Brandl 2009-04-05 14:40:06 +00:00
parent 1956d5c15f
commit a7ec0726e2
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Doc/library/pickle.rst
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@ -458,6 +458,15 @@ Pickling and unpickling normal class instances
For :term:`new-style class`\es, if :meth:`__getstate__` returns a false For :term:`new-style class`\es, if :meth:`__getstate__` returns a false
value, the :meth:`__setstate__` method will not be called. value, the :meth:`__setstate__` method will not be called.
.. note::
At unpickling time, some methods like :meth:`__getattr__`,
:meth:`__getattribute__`, or :meth:`__setattr__` may be called upon the
instance. In case those methods rely on some internal invariant being
true, the type should implement either :meth:`__getinitargs__` or
:meth:`__getnewargs__` to establish such an invariant; otherwise, neither
:meth:`__new__` nor :meth:`__init__` will be called.
Pickling and unpickling extension types Pickling and unpickling extension types
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^