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Date: Thu, 23 May 2013 14:42:47 -0400
From: Dave Angel <davea@davea.name>
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To: python-list@python.org
Subject: Re: PEP 378: Format Specifier for Thousands Separator
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On 05/23/2013 11:26 AM, Carlos Nepomuceno wrote:
> ----------------------------------------
>> Date: Thu, 23 May 2013 06:44:05 -0700
>> Subject: Re: PEP 378: Format Specifier for Thousands Separator
>> From: pruebauno@latinmail.com
>> To: python-list@python.org
> [...]

You left out the part where a and f are initialized:


 >>> a='%s'
 >>> f=(3,5)


>>>>> 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.

try the following:

print a % (f,)

The trouble is, it doesn't generalize very readily, so it's difficult to 
use in a function like eggs()

-- 
DaveA