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Best way to add values from keys
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I have a data structure that looks like this:

dates = {}; last_song = [] #; year = {}; week = {}; date = {};
artist = []; song = {}
# dates = {'2007': {'25': {'06/23/07': {'aerosmith': [{'sweet
emotion': 1}, {'dream on': 2}],
# 'Metallica': [{'Fade to
Black': 1}, {'Master of Puppets': 1}]},
# 'last_song': [Master of Puppets', 'Fade to Black',
'sweet emotion']}}}

What is the most effecient way to go through a week and determine how
many times each song was played?

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