Hi,
I'm trying to be very clever:
class tst(object):
def destroy(self):
print 'Cleaning up.'
self.__del__ = lambda: None
def __del__(self):
raise RuntimeError('Instance destroyed without running destroy! Hell
may break loose!')
However, it doesn't work:
In [2]: t = tst()
In [3]: t = None
Exception RuntimeError: RuntimeError('Instance destroyed without running
destroy! Hell may break loose!',) in <bound method tst.__del__ of <__main__.tst
object at 0x978566c>> ignored
In [4]: t = tst()
In [5]: t.destroy()
Cleaning up.
In [6]: t = None
Exception RuntimeError: RuntimeError('Instance destroyed without running
destroy! Hell may break loose!',) in <bound method tst.__del__ of <__main__.tst
object at 0x978566c>> ignored
$ python -V
Python 2.6.4
Apparently Python calls the class attribute __del__ rather than the
instance's __del__ attribute. Is that a bug or a feature? Is there any
way to implement the desired functionality without introducing an
additional destroy_has_been_called attribute?
(I know that invocation of __del__ is unreliable, this is just an
additional safeguard to increase the likelihood of bugs to get noticed).
Best,
-Nikolaus
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