You could also just join the dicts before passing them to the template. It looks like it's relatively straightforward (scores is just a list that contains dicts of a 'Number' and a 'score', right?) Then you could turn scores into a dict, assuming Numbers are unique:
Then in your persons list in the template you'll just need to display person.score.
-- scores_new = {score['Number']:score['score'] for score in scores}
And then update the persons dict to include the score:
for person in persons: person.update({'score': scores_new.get(person['Number'])})
Then in your persons list in the template you'll just need to display person.score.
If you want to get really fancy (if, say, there's more than just a score you need to pull from the dicts in scores) you can see how to merge two lists of dicts on a common key here:
http://stackoverflow.com/questions/5501810/join-two-lists-of-dictionaries-on-a-single-key
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