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

[Ram Rachum]

I'm not sure what you mean. Can you please give an example?

On Mon, Nov 17, 2014 at 8:01 PM, Neil Girdhar <mistersheik at gmail.com> wrote:

> 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
>>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>>
>>>>>
>>>>
>>>
>>
>
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