Message 166782 - Python tracker

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Author	loewis
Recipients	cvrebert, docs@python, eric.snow, jcea, loewis, meador.inge, pitrou, rhettinger, serhiy.storchaka
Date	2012-07-29.16:18:04
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1343578685.01.0.787516894062.issue15436@psf.upfronthosting.co.za>
In-reply-to

Content
rhettinger: users frequently need sys.getsizeof. See, for example, http://stackoverflow.com/questions/1331471/in-memory-size-of-python-stucture http://stackoverflow.com/questions/449560/how-do-i-determine-the-size-of-an-object-in-python http://stackoverflow.com/questions/2117255/python-deep-getsizeof-list-with-contents http://stackoverflow.com/questions/11301295/measure-object-size-accurately-in-python-sys-getsizeof-not-functioning [and so on] In what cases, do you think, it generates meaningless results? I find the results for the shared-keys dictionary quite meaningful and natural. sys.getsizeof is certainly CPython-specific. However, __sizeof__ is not just an implementation detail of sys.getsizeof, just as __len__ is not an implementation detail of len(). Authors of extension types are supposed to implement it if object.__sizeof__ is incorrect.

rhettinger: users frequently need sys.getsizeof. See, for example,

http://stackoverflow.com/questions/1331471/in-memory-size-of-python-stucture
http://stackoverflow.com/questions/449560/how-do-i-determine-the-size-of-an-object-in-python
http://stackoverflow.com/questions/2117255/python-deep-getsizeof-list-with-contents
http://stackoverflow.com/questions/11301295/measure-object-size-accurately-in-python-sys-getsizeof-not-functioning
[and so on]

In what cases, do you think, it generates meaningless results? I find the results for the shared-keys dictionary quite meaningful and natural.

sys.getsizeof is certainly CPython-specific. However, __sizeof__ is not just an implementation detail of sys.getsizeof, just as __len__ is not an implementation detail of len(). Authors of extension types are supposed to implement it if object.__sizeof__ is incorrect.

History
Date	User	Action	Args
2012-07-29 16:18:05	loewis	set	recipients: + loewis, rhettinger, jcea, pitrou, cvrebert, meador.inge, docs@python, eric.snow, serhiy.storchaka
2012-07-29 16:18:05	loewis	set	messageid: <1343578685.01.0.787516894062.issue15436@psf.upfronthosting.co.za>
2012-07-29 16:18:04	loewis	link	issue15436 messages
2012-07-29 16:18:04	loewis	create