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

[Guido van Rossum]

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



-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)