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Mon Aug 23 02:47:14 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-August/048225.html

> ... 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'

Raymond

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Showing content from https://mail.python.org/pipermail/python-dev/2004-August/048225.html below:

[Python-Dev] Re: Update PEP 292