[Python-Dev] chained assignment weirdity

Devin Jeanpierre jeanpierreda at gmail.com
Tue Nov 6 19:19:56 CET 2012


On Nov 6, 2012 1:05 PM, "Ned Batchelder" <ned at nedbatchelder.com> wrote:
>> On 11/6/2012 11:26 AM, R. David Murray wrote:
>>>> On 2012年11月06日 18:14:38 +0200, Serhiy Storchaka <storchaka at gmail.com>
wrote:
>>>>>> Another counterintuitive (and possible wrong) example:
>>>>>> >>> {print('foo'): print('bar')}
>>> bar
>>> foo
>>> {None: None}
>>>> http://bugs.python.org/issue11205
>>> This seems to me better left undefined, since there's hardly ever a need
to know the precise evaluation sequence between keys and values, and
retaining some amount of "unspecified" to allow for implementation
flexibility is a good thing.
"Left undefined"? The behavior was defined, but CPython didn't follow the
defined behaviour.
--Devin (phone)
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