Message 317098 - Python tracker

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Author	ncoghlan
Recipients	ncoghlan
Date	2018-05-19.05:41:19
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1526708479.7.0.682650639539.issue33576@psf.upfronthosting.co.za>
In-reply-to

Content
Type creation currently wraps all exceptions raised by __set_name__ calls with a generic RuntimeError: https://github.com/python/cpython/blob/master/Objects/typeobject.c#L7263 Unfortunately, this makes it difficult to use __set_name__ for descriptor validation operations, since it means the specific exception type gets lost, and it makes the traceback much harder to read (since the generic error messages appears at the end, while the actual error appears somewhere in the middle). See https://bugs.python.org/issue21145#msg317097 for a specific example.

Type creation currently wraps all exceptions raised by __set_name__ calls with a generic RuntimeError: https://github.com/python/cpython/blob/master/Objects/typeobject.c#L7263

Unfortunately, this makes it difficult to use __set_name__ for descriptor validation operations, since it means the specific exception type gets lost, and it makes the traceback much harder to read (since the generic error messages appears at the end, while the actual error appears somewhere in the middle).

See https://bugs.python.org/issue21145#msg317097 for a specific example.

History
Date	User	Action	Args
2018-05-19 05:41:19	ncoghlan	set	recipients: + ncoghlan
2018-05-19 05:41:19	ncoghlan	set	messageid: <1526708479.7.0.682650639539.issue33576@psf.upfronthosting.co.za>
2018-05-19 05:41:19	ncoghlan	link	issue33576 messages
2018-05-19 05:41:19	ncoghlan	create