飄逸的python – 一段統計次數程式的進化

這段程式是從給定的列表中統計各個小夥伴以及他們的出現次數。

littlebuddys = ['jack','terry','john','rooney','ross','kzc','john','ross','ross']

新手程式員

d = {}for buddy in littlebuddys:    if buddy not in d:        d[buddy] = 0    d[buddy] += 1

信奉EAFP的程式員

d = {}for buddy in littlebuddys:    try:        d[buddy] += 1    except KeyError:        d[buddy] = 1

喜歡用預設值避免異常的程式員

d = {}for buddy in littlebuddys:    d[buddy] = d.get(buddy,0) + 1

堅定初始化的程式員

d = dict.fromkeys(littlebuddys,0)for buddy in littlebuddys:    d[buddy] += 1

生活在水深火熱中的程式員

from collections import defaultdictd = defaultdict(int)for buddy in littlebuddys:    d[buddy] += 1

掃地的老太太

from collections import Counterd = Counter(littlebuddys)