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Re: PEP 378: Format Specifier for Thousands Separator

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From Terry Jan Reedy <tjreedy@udel.edu>
Subject Re: PEP 378: Format Specifier for Thousands Separator
Date Thu, 23 May 2013 16:19:33 -0400
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On 5/23/2013 2:42 PM, Dave Angel wrote:
> On 05/23/2013 11:26 AM, Carlos Nepomuceno wrote:

>
>>>>>> eggs(a,f)
>>> Traceback (most recent call last):
>>> File "<pyshell#29>", line 1, in <module>
>>> eggs(a,f)
>>> File "<pyshell#1>", line 1, in eggs
>>> def eggs(spam, ham): return spam % ham
>>> TypeError: not all arguments converted during string formatting
>>>>>> '%s'%(5%3)
>>> '2'
>>
>> So % doesn't handle tuples! Why's that? Is it intentional (by design)?
>>
>
> It's a conflict in the design.  A tuple is used to supply multiple
> arguments to the % operator.  So if you want to have a tuple as the
> first argument, you need to enclose it in another tuple.

The problem is that interpolating 1 to many items into a string is *not* 
a binary operation. The needed hack to pretend that it is, using a tuple 
to represent multiple items rather than just itself, was one of the 
reasons for making string formatting a honest function, where multiple 
items to be formatted are passed as multiple arguments.

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Re: PEP 378: Format Specifier for Thousands Separator Andrew Berg <bahamutzero8825@gmail.com> - 2013-05-21 14:53 -0500
  Re: PEP 378: Format Specifier for Thousands Separator Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-22 02:59 +0000
    Re: PEP 378: Format Specifier for Thousands Separator Andrew Berg <bahamutzero8825@gmail.com> - 2013-05-21 22:38 -0500
    Re: PEP 378: Format Specifier for Thousands Separator Skip Montanaro <skip@pobox.com> - 2013-05-22 05:45 -0500
      Re: PEP 378: Format Specifier for Thousands Separator Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-22 14:58 +0000
        Re: PEP 378: Format Specifier for Thousands Separator Ned Batchelder <ned@nedbatchelder.com> - 2013-05-22 14:30 -0400
          Re: PEP 378: Format Specifier for Thousands Separator nn <pruebauno@latinmail.com> - 2013-05-22 13:26 -0700
            RE: PEP 378: Format Specifier for Thousands Separator Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-23 01:31 +0300
              Re: PEP 378: Format Specifier for Thousands Separator nn <pruebauno@latinmail.com> - 2013-05-23 06:44 -0700
                RE: PEP 378: Format Specifier for Thousands Separator Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-23 18:26 +0300
                Re: PEP 378: Format Specifier for Thousands Separator Dave Angel <davea@davea.name> - 2013-05-23 14:42 -0400
                Re: PEP 378: Format Specifier for Thousands Separator nn <pruebauno@latinmail.com> - 2013-05-24 06:50 -0700
                Re: PEP 378: Format Specifier for Thousands Separator Terry Jan Reedy <tjreedy@udel.edu> - 2013-05-23 16:19 -0400
                RE: PEP 378: Format Specifier for Thousands Separator Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-24 01:20 +0300
                Re: PEP 378: Format Specifier for Thousands Separator Jerry Hill <malaclypse2@gmail.com> - 2013-05-23 21:17 -0400
                RE: PEP 378: Format Specifier for Thousands Separator Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-24 04:41 +0300
            Re: PEP 378: Format Specifier for Thousands Separator Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-05-23 01:30 +0100
            RE: PEP 378: Format Specifier for Thousands Separator Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-23 03:44 +0300

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