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pythonperformanceoptimizationdictionarylist-comprehension
Gianni Spear
Gianni Spear

Reputation: 7924

Python list comprehension for dictionaries an example

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}

where "points" is a list of value. My question is, is it possible to convert in a list comprehension for dictionaries in order to speed up my code?

Upvotes: 2

Views: 110

Answers (1)

Joran Beasley
Joran Beasley

Reputation: 113940

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

Upvotes: 6

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