difference 2.3 versus 2.2
Martin v. Löwis
martin at v.loewis.de
Fri Jan 24 04:46:04 EST 2003
mis6 at pitt.edu (Michele Simionato) writes:
> Therefore, if I understand correctly, 'heap type' means 'user-defined type',
> as opposed to built-in typ).
Roughly, yes. You can define a heap type using the C API if you want,
but they are typically defined through a class statement.
> This restriction (i.e. it is possible to change the __class__ attribute
> only for heap types) should be reported in "What's new in Python 2.3",
> since it is a change that breaks old code. I will send a copy of the
> present mail to python-docs at python.org.
It would be much better if you posted a documentation patch to
sf.net/projects/python.
I don't think this change is major enough to find mentioning in
"What's new"; I really doubt any real application will be affected by
that. It is listed in the NEWS file, as
- Assignment to __class__ is disallowed if either the old or the new
class is a statically allocated type object (such as defined by an
extension module). This prevents anomalies like 2.__class__ = bool.
Regards,
Martin
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