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Mon Aug 23 02:50:32 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-August/048226.html

On Sun, 2004-08-22 at 20:47, Raymond Hettinger wrote:
> > ... the implementation (patch) I'm going to post
> > will require throw the ValueError for all bad placeholders.
> 
> Since you're overriding the mod operator, it may be best to emulate its
> behavior which is to throw a KeyError:
> 
> 
> 
> >>> '%(bingo)s' % {'bongo':'xxx'}
> 
> Traceback (most recent call last):
>   File "<pyshell#1>", line 1, in -toplevel-
>     '%(bingo)s' % {'bongo':'xxx'}
> KeyError: 'bingo'

That's a different error, and one that Template still throws, if a
placeholder can't be found in the mapping.  The ValueError is thrown
when an invalid placeholder specification is found.

-Barry

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[Python-Dev] Re: Update PEP 292