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Showing content from https://mail.python.org/pipermail/python-dev/2008-January/075854.html below:

[Python-Dev] Extracting variables from string.Template objects

[Python-Dev] Extracting variables from string.Template objectsAahz aahz at pythoncraft.com
Fri Jan 4 16:52:56 CET 2008
On Fri, Jan 04, 2008, Isaac Morland wrote:
>
> I would like to add this as a method of string.Template, which I think 
> amounts to changing "template" to "self" and putting it in the Template 
> class in string.py rather than on its own.  If the general idea is 
> approved I would be happy to make a patch.

Make a patch regardless of whether you get any approval -- someone may
later have a different opinion, and writing a patch records your work.

> Also, on a related issue, does it make sense to scan the template
> string for invalid escape sequences in Template.__init__?  For the
> applications I can imagine of string.Template, I would prefer to get
> an error upon creating the Template object rather than arbitrarily
> later when I try to .substitute with it.

No, create an is_valid() method at best.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.
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