[a,b,c,d] = 1,2,3,4

ast nomail at invalid.com
Tue Aug 25 17:09:46 CEST 2015


"Joel Goldstick" <joel.goldstick at gmail.com> a écrit dans le message de 
news:mailman.23.1440513059.11709.python-list at python.org...
> On Tue, Aug 25, 2015 at 10:16 AM, ast <nomail at invalid.com> wrote:
>>>>> [a,b,c,d] = 1,2,3,4
>>>>> a
>>
>> 1
>>>>>
>>>>> b
>>
>> 2
>>>>>
>>>>> c
>>
>> 3
>>>>>
>>>>> d
>>
>> 4
>>
>> I have never seen this syntax before. Is it documented.
>> Is there a name for that ?
>>
>> thx
>> --
>> https://mail.python.org/mailman/listinfo/python-list
>
> its called list unpacking or packing (?)
>
> the right side is considered a tuple because of the commas
>>>> a = 1,2,3
>>>> a
> (1, 2, 3)
>>>> a[1]
> 2
>>>>
>
>
> http://www.developer.com/lang/other/article.php/630101/Learn-to-Program-using-Python-Unpacking-Tuples.htm
>
>
> -- 
> Joel Goldstick
> http://joelgoldstick.com

Yes you are right, it is related to tuple unpacking
Here are some useful examples I found.
http://svn.python.org/projects/python/branches/pep-0384/Lib/test/test_unpack_ex.py 



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