Message 255778 - Python tracker

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Author	yselivanov
Recipients	gvanrossum, ncoghlan, oconnor663, vstinner, yselivanov
Date	2015-12-02.20:42:08
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<[email protected]>
In-reply-to

Content
> Yury, can you help me understand why `hasattr("foo", "bar")` triggers the infinite loop there, but not `print("foo")`? hasattr uses getattr under the hood. getattr raises an AttributeError, and that triggers PyErr_SetError, which has an infinite "while" loop. Instead of "hasattr" you can use anything that raises an error.

> Yury, can you help me understand why `hasattr("foo", "bar")` triggers the infinite loop there, but not `print("foo")`?


hasattr uses getattr under the hood. getattr raises an AttributeError, and that triggers PyErr_SetError, which has an infinite "while" loop.  Instead of "hasattr" you can use anything that raises an error.

History
Date	User	Action	Args
2015-12-02 20:42:08	yselivanov	set	recipients: + yselivanov, gvanrossum, ncoghlan, vstinner, oconnor663
2015-12-02 20:42:08	yselivanov	set	messageid: <[email protected]>
2015-12-02 20:42:08	yselivanov	link	issue25779 messages
2015-12-02 20:42:08	yselivanov	create