[Python-3000] suggestion: structured assignment

[allyourcode at gmail.com]

Indeed. Thank you, Guido.

On 5/28/08, Guido van Rossum <guido at python.org> wrote:
> Apart from the missing comma after 'big' this is already supported.
>
> The time machine strikes again!
>
> --Guido
>
> On Wed, May 28, 2008 at 6:23 PM, Daniel Wong <allyourcode at gmail.com> wrote:
>> Hi,
>>
>> Are there plans for introducing syntax like this:
>>
>> (a, (b[2], c)) = ('big' ('red', 'dog'))
>>
>> It seems quite doable, because Professor Hillfinger at UC Berkeley
>> created pyth, a dialect of Python, which has this feature. See page 10
>> of the spec he created for his students to implement the language:
>>
>> http://inst.eecs.berkeley.edu/~cs164/sp08/docs/pyth.pdf
>>
>> Of course, this idea could also be applied to 'for' constructs (loops,
>> list comprehensions, and generators) where assignments are implicit.
>>
>> Parallel looping (esp using zip) is a great use case for this. Here's
>> a case that's come up more than once for me that "structured"
>> assignments would solve really nicely:
>>
>> for n, (a, b) in enumerate(list_of_pairs): ...
>>
>> Currently, I must do the following instead:
>>
>> for n, pair in enumerate(list_of_pairs):
>>  a, b = pair
>>  ...
>>
>> This isn't such a great solution, because there's more indirection
>> with the introduction of an otherwise useless variable; and (less
>> significantly) there's an extra line of code that doesn't actually
>> compute anything.
>>
>> Thoughts?
>>
>> Daniel
>>
>> PS: Sorry if this has already been discussed; I'm new to this list and
>> I didn't see this mentioned in PEP 3099, unless it's covered under the
>> LL(1) clause.
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>
>
>
> --
> --Guido van Rossum (home page: http://www.python.org/~guido/)
>