extracting string.Template substitution placeholders

[Mark Lawrence]

On 17/01/2014 06:07, gmflanagan wrote:
> On Sunday, January 12, 2014 3:08:31 PM UTC, Eric S. Johansson wrote:
>> As part of speech recognition accessibility tools that I'm building, I'm
>>
>> using string.Template. In order to construct on-the-fly grammar, I need
>>
>> to know all of the identifiers before the template is filled in. what is
>>
>> the best way to do this?
>>
>
> Try this:
>
> import string
> cmplxstr="""a simple $string a longer $string a $last line ${another} one"""
>
> def finditer(s):
>      for match in string.Template.pattern.finditer(s):
>          arg = match.group('braced') or match.group('named')
>          if arg:
>              yield arg
>
>
> if __name__ == '__main__':
>      print set(finditer(cmplxstr))
>

Would you please read and action this 
https://wiki.python.org/moin/GoogleGroupsPython to prevent us seeing the 
double line spacing above, thanks.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence