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Beginner's Question (or bug in python?)
Kalle Svenssonkalle at gnupung.net
Fri Apr 20 13:32:43 EDT 2001
Sez Rolf Magnus:> Hello. I have a problem understanding why the behaviour of python depends> on class names. I have the following python script:[snip]> If I execute this, I get the following:>> initializing fred> initializing foo> Hello world> deleting foo> Exception exceptions.AttributeError: "'None' object has no attribute> '__del__'" in <method Foo.__del__ of Foo instance at 80c3c00> ignored>>> If I instead call the base class Hans instead of Fred, it works as expected:>> initializing fred> initializing foo> Hello world> deleting foo> deleting fred>> This seems to be the case for Python 1.52 and 2.1 (not sure about 2.1,> because I only tested the first case and got the error message).> And if I add a "del x" after the last line, it works in both cases. This> seems odd to me, but since I am a python beginner, there is perhaps> something important I don't know.Quoting the Reference Manual:"""Also, when __del__() is invoked is response to a module being deleted (e.g.,when execution of the program is done), other globals referenced by the__del__() method may already have been deleted. """Seehttp://www.python.org/doc/current/ref/customization.html for more.Peace, Kalle-- Email:kalle at gnupung.net | You can tune a filesystem, but youWeb:http://www.gnupung.net/ | can't tune a fish. -- man tunefs(8)PGP fingerprint: 0C56 B171 8159 327F 1824 F5DE 74D7 80D7 BF3B B1DD [ Not signed due to lossage. Blame Microsoft Outlook Express. ]
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