Explanation of this Python language feature? [x for x in x for x in x] (to flatten a nested list)

[Mark Lawrence]

On 04/04/2014 21:58, Mark H Harris wrote:
> On 4/4/14 3:20 AM, Mark Lawrence wrote:
>> On 04/04/2014 03:29, Mark H Harris wrote:
>>>
>>>     Now, about Python2.  It has not died.  It appears to be 'useful'.
>>> {snip}
>>>
>>
>> For a lot of people, if it ain't broke, don't fix it.
>>
>
> hi Mark, yes that's my point. I have heard rumors of python2.8? At some
> point I would expect that the Cpython interpreter would 'freeze' and no
> one would fix it any longer. I have a serious question, namely, why does
> the Cpython community continue to suppport two interpreters rather than
> asking the Cpython user-base to migrate to Cpython3?
>
> Oh, I have another serious question about implementations. I'm not sure
> about (50) implementations, but I know that Jython and IronPython are
> serious contenders (although, I have not, nor probably will, use them).
>
> Are the other implementation communities *also* supporting two versions
> of the language?   Is there a Jython2 &also a Jython3 ?
>
> marcus

You could answer all of the above for yourself if you were to use your 
favourite search engine.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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