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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: string formatting
Date: Sat, 07 May 2011 03:55:01 -0400
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On 5/6/2011 8:09 PM, Chris Angelico wrote:
> On Sat, May 7, 2011 at 6:54 AM, Terry Reedy<tjreedy@udel.edu>  wrote:
>> def emsg(x):
>>   if isinstance(x,tuple):
>>     x = (x,)
>>   print(The following object caused a proplem: %s" % x)
>>
>
> Couldn't you just do that unconditionally?
> print(The following object caused a proplem: %s" % (x,))

I guess so, as long as one remembers the ','. That does not obviate the 
fact that % x is an attractive nuisance which works until it does not.

-- 
Terry Jan Reedy