Python list operation

list_operation.py

# -*- coding: utf-8 -*-
from itertools import groupby

score = [
   { "id": 1, "name": "アリス", "class": "1-A", "score": 92 },
   { "id": 2, "name": "カレン", "class": "1-B", "score": 43 },
   { "id": 3, "name": "しの", "class": "1-A", "score": 21 },
   { "id": 4, "name": "あやや", "class": "1-A", "score": 94 },
   { "id": 5, "name": "よーこ", "class": "1-A", "score": 38 }
]

# groupby(クラス別にグルーピング)
class_group = groupby(score, lambda r:r["class"])

# sort(スコア降順)
score_map = {}
for dept, item in class_group:
    # groupbyオブジェクトは一度iterationさせると消える
    class_map[dept] = sorted(item, key=lambda x:x["score"], reverse=True)
  
print class_map