07.11.13 00:32, Victor Stinner написав(ла):
I'm trying to avoid unnecessary temporary Unicode strings when
possible (see issue #19512). While working on this, I saw that Python
likes preparing an user friendly message to explain why getting an
attribute failed. The problem is that in most cases, the caller
doesn't care of the message: the exception is simply deleted. For
example, hasattr() deletes immediatly the AttributeError.
It would be nice to only format the message on demand. The
AttributeError would keep a reference to the type. Keeping a strong
reference to the type might change the behaviour of some applications
in some corner cases. (Holding a reference to the object would be
worse, and the type looks to be preferred over the type to format the
error message.)
See also:
http://bugs.python.org/issue18156 : Add an 'attr' attribute to
AttributeError
http://bugs.python.org/issue18162 : Add index attribute to IndexError
http://bugs.python.org/issue18163 : Add a 'key' attribute to KeyError
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