json文件（Python）的問題

Question

我有這個json文件的問題：Zips.json！ 。

我沒有找到一種方法來計算每個州的郵政編碼數量。我嘗試過很多辦法，如本：

file=open("C:\Users\Alex\Downloads/zips.json","r") 
lines=json.loads(file.readline()) 
number=0 
states=lines["state"] 
for line in file: 
    lines=json.loads(line) 
    if lines ["state"]==states: 
     number=number+1 
    else: 
     print u"states:",states, u"Number of codes: ",number 
     states=lines["state"] 

Answer 1

要做到這一點，最簡單的方法是使用一個collections.Counter：

import json 
from collections import Counter 
from operator import itemgetter 

counter = None 
state_getter = itemgetter('state') 

with open('zips.json') as fh: 
    zips_data = (json.loads(line) for line in fh) 
    states_names = map(itemgetter('state'), zips_data) 
    counter = Counter(states_names) 

print(counter)