[Python-Dev] Re: Update PEP 292 (original) (raw)

Barry Warsaw barry at python.org
Mon Aug 23 02:50:32 CEST 2004

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

-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 307 bytes Desc: This is a digitally signed message part Url : http://mail.python.org/pipermail/python-dev/attachments/20040822/372a6fde/attachment.pgp

More information about the Python-Dev mailing list