用於詞典的Python列表理解

Question

I have the following script: 

dict_class = dict() 
for p in points: 
    dict_class[p.class] = dict_class.get(p.class, 0) + 1 

print dict_class 
{1: 1314, 2: 1050} 

其中「points」是值的列表。 我的問題是，爲了加快我的代碼，是否有可能將字典的理解轉換爲字典？

Answer 1

from collections import Counter 
from operator import attrgetter 
Counter(map(attrgetter("class"),points))