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import osimport jsonos.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]######################################## method1def 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
######################################## method2from collections import defaultdictdef get_counts2(sequence): counts=defaultdict(int)
for x in sequence:
counts[x]+=1
return counts
print(get_counts2(time_zones))########################################### method3from collections import Countercounts=Counter(time_zones)print(counts)原文链接：https://segmentfault.com/q/1010000009322032?sort=created
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本文转自独弹古调 51CTO博客，原文链接：http://blog.51cto.com/hunkz/1926303，如需转载请自行联系原作者