[Python-3000] PEP 3101 str.format() equivalent of '%#o/x/X'?

[Eric Smith]

Eric Smith wrote:
> Barry?

By which I meant "Barry, what's your opinion?", not "who is Barry?" 
(which I well know).  Geez, I write the worst email sometimes.

ERic.

> 
> Guido van Rossum wrote:
>> I'd check with Barry, but given that .format() is a new feature in
>> these releases anyway and this is a pretty small addition to one tiny
>> bit of code I would have been okay with it if I were release manager.
>>
>> On Mon, Jun 30, 2008 at 11:36 AM, Eric Smith
>> <eric+python-dev at trueblade.com> wrote:
>>> I finally have some cycles for this.  Is it okay to add '#' to hex, 
>>> bin, and
>>> oct for str.format(), even though it's now after the beta?
>>>
>>> Eric.
>>>
>>> Guido van Rossum wrote:
>>>> Of course.
>>>>
>>>> On Fri, May 30, 2008 at 12:23 PM, Eric Smith
>>>> <eric+python-dev at trueblade.com> wrote:
>>>>> Guido van Rossum wrote:
>>>>>> I'd be fine with adding '#' back to the formatting language for 
>>>>>> hex and
>>>>>> oct.
>>>>> And bin, I assume?
>>>>>
>>>>>> On Thu, May 29, 2008 at 5:45 PM, Eric Smith
>>>>>> <eric+python-dev at trueblade.com> wrote:
>>>>>>> wesley chun wrote:
>>>>>>>> On 5/29/08, Eric Smith <eric+python-dev at trueblade.com> wrote:
>>>>>>>>> Marcin 'Qrczak' Kowalczyk wrote:
>>>>>>>>>> Except that it works incorrectly for negative numbers.
>>>>>>>> wow, that is a great point.  i didn't think of this either. it 
>>>>>>>> makes
>>>>>>>> it very inconvenient (see below) and makes it more difficult to say
>>>>>>>> we've completed replaced the '%' operator.
>>>>>>>>
>>>>>>>>
>>>>>>>>>  I can't really think of any other way that doesn't involve
>>>>>>>>> converting
>>>>>>>>> the
>>>>>>>>> number to a string and then operating on that, just to get the 
>>>>>>>>> sign.
>>>>>>>> here's one way of doing it without converting to a string first 
>>>>>>>> (it's
>>>>>>>> ugly
>>>>>>>> too):
>>>>>>>>
>>>>>>>>>>> i = -45
>>>>>>>>>>> '{0}0x{1:x}'.format('-' if i < 0 else '', abs(i))
>>>>>>>> '-0x2d'
>>>>>>> Agreed, ick!
>>>>>>>
>>>>>>>> thx for putting it (back) in,
>>>>>>> I didn't say I would, I said I would if a decision was reached 
>>>>>>> :)  I'd
>>>>>>> like
>>>>>>> to see some more consensus, and I hope that Talin (the PEP author)
>>>>>>> chimes
>>>>>>> in.
>>>>>>>
>>>>>>> Eric.
>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>
>>>>
>>>>
>>>
>>
>>
>>
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