[Python-ideas] If branch merging
Wolfram Hinderer
wolfram.hinderer at googlemail.com
Mon Jun 8 17:24:04 CEST 2015
Am 08.06.2015 um 14:38 schrieb Nick Coghlan:
> On 8 June 2015 at 22:12, Steven D'Aprano <steve at pearwood.info> wrote:
>
> [In relation to named subexpressions leaking to the surrounding
> namespace by default]
>
>>> What does "x[(a.b as b)] = b" mean
>>
>> surely it simply means the same as:
>>
>> b = a.b
>> x[b] = b
>
> Right, but it reveals the execution order jumping around in a way that
> is less obvious in the absence of side effects.
I'm lost. The evaluation order of today (right hand side first)
would make "x[(a.b as b)] = b" mean
x[a.b] = b
b = a.b
(assuming looking up a.b has no side effects).
Would the introduction of named subexpressions change that, and how?
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