PEP 378: Format Specifier for Thousands Separator
Dave Angel
davea at davea.name
Thu May 23 14:42:47 EDT 2013
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 at latinmail.com
>> To: python-list at 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
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