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Thu Nov 8 02:11:21 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-November/122598.html

On 11/7/2012 5:11 PM, Terry Reedy wrote:
> On 11/7/2012 4:39 PM, Ned Batchelder wrote:
>
>> Just to be clear: the reference guide says that the behavior *SHOULD BE*
>> (but is not yet) this:
>>
>>     Python 3.3.0
>>      >>> {print("a"):print("b")}
>>     a
>>     b
>>     {None: None}
>>      >>> d = {}
>>      >>> d[print("a")] = print("b")
>>     b
>>     a
>>      >>>
>>
>> Is this or is this not "weird" to you?
>
> Not weird. Expressions and assignment targets are each consistently 
> evaluated left to right (except as *necessarily* alter by precedence), 
> with expressions evaluated before targets.
>
Sorry, I should have been clearer: I was asking about weird not to say, 
"This is weird and should be changed!", but to get clarification from 
Serhiy about his statement, " It will be weird if a dict comprehension 
and a plain loop will be inconsistent."  I honestly didn't know which 
behavior he considered inconsistent and therefore weird.

--Ned.

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[Python-Dev] chained assignment weirdity