[Python-ideas] Implement `itertools.permutations.__getitem__` and `itertools.permutations.index`

[Neil Girdhar]

Sure, but even list has copy().  I meant settable property on the generator
not on the generated permutation.

On Mon, Nov 17, 2014 at 12:44 PM, Ram Rachum <ram at rachum.com> wrote:

> Thanks :)
>
> Settable properties are a no-go because I wanted permutation spaces to be
> immutable. Since the cost of creating a new space is nil (permutations are
> created on-demand, not on space creation) there isn't a reason to mutate an
> existing space.
>
> I don't think using a copy() method to would be very nice. But I guess
> it's a matter of taste.
>
> On Mon, Nov 17, 2014 at 7:33 PM, Neil Girdhar <mistersheik at gmail.com>
> wrote:
>
>> Looks great!
>>
>> Why did you go with "get_rapplied", "unrapplied", etc. instead of having
>> a copy() method and using settable properties?
>>
>> On Mon, Nov 17, 2014 at 10:50 AM, Ram Rachum <ram at rachum.com> wrote:
>>
>>> Hi guys,
>>>
>>> I just wanted to give an update on this: I just released my own code
>>> that does this to PyPI: https://pypi.python.org/pypi/combi
>>>
>>>
>>> Thanks,
>>> Ram.
>>>
>>> On Tue, Jun 10, 2014 at 9:24 AM, Ram Rachum <ram at rachum.com> wrote:
>>>
>>>> I'll email you if/when it's released :)
>>>>
>>>>
>>>> On Tue, Jun 10, 2014 at 9:04 AM, Neil Girdhar <mistersheik at gmail.com>
>>>> wrote:
>>>>
>>>>> I really like this and hope that it eventually makes it into the
>>>>> stdlib.  It's also a good argument for your other suggestion whereby some
>>>>> of the itertools to return Iterables rather than Iterators like range does.
>>>>>
>>>>> Best,
>>>>>
>>>>> Neil
>>>>>
>>>>> On Wednesday, May 7, 2014 1:43:20 PM UTC-4, Ram Rachum wrote:
>>>>>
>>>>>> I'm probably going to implement it in my python_toolbox package. I
>>>>>> already implemented 30% and it's really cool. It's at the point where I
>>>>>> doubt that I want it in the stdlib because I've gotten so much awesome
>>>>>> functionality into it and I'd hate to (a) have 80% of it stripped and (b)
>>>>>> have the class names changed to be non-Pythonic :)
>>>>>>
>>>>>>
>>>>>> On Wed, May 7, 2014 at 8:40 PM, Tal Einat <tale... at gmail.com> wrote:
>>>>>>
>>>>>> On Wed, May 7, 2014 at 8:21 PM, Ram Rachum <ram.r... at gmail.com>
>>>>>>> wrote:
>>>>>>> > Hi Tal,
>>>>>>> >
>>>>>>> > I'm using it for a project of my own (optimizing keyboard layout)
>>>>>>> but I
>>>>>>> > can't make the case that it's useful for the stdlib. I'd
>>>>>>> understand if it
>>>>>>> > would be omitted for not being enough of a common need.
>>>>>>>
>>>>>>> At the least, this (a function for getting a specific permutation by
>>>>>>> lexicographical-order index) could make a nice cookbook recipe.
>>>>>>>
>>>>>>> - Tal
>>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> Python-ideas mailing list
>>>>> Python-ideas at python.org
>>>>> https://mail.python.org/mailman/listinfo/python-ideas
>>>>> Code of Conduct: http://python.org/psf/codeofconduct/
>>>>> --
>>>>>
>>>>> ---
>>>>> You received this message because you are subscribed to a topic in the
>>>>> Google Groups "python-ideas" group.
>>>>> To unsubscribe from this topic, visit
>>>>> https://groups.google.com/d/topic/python-ideas/in2gUQMFUzA/unsubscribe
>>>>> .
>>>>> To unsubscribe from this group and all its topics, send an email to
>>>>> python-ideas+unsubscribe at googlegroups.com.
>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>
>>>>>
>>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20141117/0500580b/attachment-0001.html>