我有一个生成的JSON文件，我正在尝试编写一个python脚本，它可以读取JSON文件，一旦满足条件，就会激活PI上的例程。 但是，我在python中读取JSON文件时遇到了麻烦，无法获取我需要的数据。
JSON文件如下所示：
{
"TimestampEpoch": 1514337528024,
"StationLat": -26.358342,
"StationLon": 120.620019,
"SoftwareVersion": "1.9.0.8120",
"DetectorModel": "LD-350",
"AntennaAlignment": 0,
"StrikeCount": 55,
"StormCount": 0,
"StrikeData": [{
"time": 29639,
"millis": 1514333639000,
"dist": 439,
"bng": 332.70000000000005,
"lat": -22.823276496341727,
"lon": 118.65980333825893,
"type": 0,
"polarity": 0,
"compoundType": 0,
"correlated": true,
"NMEAChecksum": 255
}, {
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"lon": 119.13533272287572,
"type": 0,
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"correlated": true,
"NMEAChecksum": 255
}, {
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}, {
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"StormData": []
}
我的Python脚本是
import urllib
import json
f = urllib.urlopen("http://mysite/lightningdata/ngxarchive.json")
values = json.load(f)
f.close()
for StrikeData in values['StrikeData']:
for key, value in StrikeData.iteritems():
print key, 'is:', value
print ''
当我运行这个脚本时，我会以可读的格式显示我的数据，并且它就在那里 - 现在我只想阅读＆＃34; dist＆＃34;在＆＃34; StrikeData＆＃34;并且条件只列出40以下的距离。这是我挣扎的地方。对于我的生活，我甚至无法通过python来打印＆＃34; dist＆＃34; key infact我无法打印任何位于＆＃34; StrikeData＆＃34;
但是，我可以阅读上面的其他按键＆＃34; StrikeData＆＃34;例如＆＃34; StationLon＆＃34; ＆＃34; StationLat＆＃34;等
任何帮助都将不胜感激。
答案 0 :(得分：0)
距离应在StrikeData['dist']：
for StrikeData in values['StrikeData']:
print 'Distance is: ', StrikeData['dist']
如果你只想显示低于40的距离，那就是：
for StrikeData in values['StrikeData']:
if StrikeData['dist'] < 40:
print 'Distance is: ', StrikeData['dist']
但是样本JSON中的数据都不符合此条件，因此不会打印任何内容。