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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: .format vs. %
Date: Sat, 31 Dec 2011 16:09:09 -0500
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:18280

On 12/31/2011 2:24 PM, Tim Chase wrote:
> On 12/31/11 12:57, Benjamin Kaplan wrote:
>> format is a method of the string class. You store the string the same way
>> you would any other.
>>
>> formatter = "Hello, {}"
>> print(formatter.format("world"))
>
> Just to note that this syntax doesn't quite work in some earlier
> versions (tested below in 2.6, which came stock in Debian Stable)

Autonumbering of {} was introduced, at my suggestion, in 3.1 and 
included with 2.7 (I presume).
>
>  >>> formatter = "Hello, {}"
>  >>> print(formatter.format("world"))
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ValueError: zero length field name in format
>
>
> It needs to be spelled "{0}"
>
> -tkc
>
>


-- 
Terry Jan Reedy