[Python-ideas] Integrate some itertools into the Python syntax

[Chris Angelico]

On Sat, Mar 26, 2016 at 9:16 AM, Michel Desmoulin
<desmoulinmichel at gmail.com> wrote:
> Le 25/03/2016 17:53, Nikolaus Rath a écrit :
>> On Mar 25 2016, Michel Desmoulin <desmoulinmichel-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
>>> It's also very convenient for generator expressions:
>>>
>>> # get random numbers between 0 and 100000, and square them
>>> # remove all numbers you can't devide by 3
>>> # then sample 100 of them
>>>
>>> numbers = (x * x for x in random.randint(100000) if x % 3 == 0)
>>> for x in numbers[:100]:
>>>     print(x)
>>
>> If there has ever been an example that I hope to never, ever see in
>> actual code than it's this one. If you have to make up stuff like that
>> to justify a proposed feature, then that does not bode well.
>
> The (x * x for x in random.randint(100000) if x % 3 == 0) is just here
> to stand for "rich generators". The example is artificial, but every
> advanced python code out there use generator.
>
> The feature is on the for loop, which is simple and elegant.
>
> What you're doing here is trolling, really.

No, it's not trolling. But there's a difficult balance to strike when
giving examples of a new feature; too simple and there's no
justification for the feature, too complex and it's a poor
justification ("if you have to make up stuff like that"). Trying to
see past the example, generalizing to code that you might yourself
write, isn't always easy.

ChrisA