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By: a guest on Apr 26th, 2012  |  syntax: None  |  size: 0.27 KB  |  hits: 15  |  expires: Never
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  1. >>> data = [{"class": "A", "point": 1.0}, {"class": "A", "point":2.0 }, {"class":"B", "point":3.0}]
  2. >>> def find_mean(l): return sum(map(lambda x:x['point'], l))/len(l)
  3. ...
  4. >>> dict([(k, find_mean(list(l))) for k,l in groupby(data, lambda x:x['class'])])
  5. {'A': 1.5, 'B': 3.0}
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