[chaley]

Originally Posted by sweth

Hmm. Is the answer maybe template functions? I was able to define a sum() function that appears to work (once I realized that args are passed in as unicode and needed to be converted before being added), but am a python newbie so the extraction of the Ns from an arbitrary number of tags is still befuddling me...

Given your use case, a template function is definitely the way to go.

Are you asking how to extract the N values in a template function? If the following is true:

• The source of the values is always the field "tags".
• The pattern is always 'recommended\..*\.[\d.]+'

Then something like the following should work for you:

def evaluate(self, formatter, kwargs, mi, locals):
	import re
	tags = mi.get('tags')
	v = 0
	if tags:
		for t in tags:
			m = re.match('recommended\..*\.([\d.]+)', t)
			if m:
				v = v + int(m.group(1))
	return v