python 对出现字符串的计数，三种方法

import os
import json
os.chdir("/data/pydata/pydata-book-master")
path='usagov_bitly_data2012-03-16-1331923249.txt'open(path).readline()
records=[json.loads(line) for line in open(path) ]
time_zones=[rec['tz'] for rec in records if 'tz' in rec]
#######################################
# method1
def get_counts(sequence):
counts={}
for x in sequence:
if x in counts:
print(x)
print(counts)
ounts[x]+=1
else:
counts[x]=1
return counts
#######################################
# method2
from collections import defaultdict
def get_counts2(sequence):
counts=defaultdict(int)
for x in sequence:
counts[x]+=1
return counts
print(get_counts2(time_zones))
##########################################
# method3
from collections import Counter
counts=Counter(time_zones)
print(counts)

原文链接：https://segmentfault.com/q/1010000009322032?sort=created