如何用Python解碼JSON？

我想用Python解碼JSON。這是JSON看起來像什麼的一小片段。如何用Python解碼JSON？

b'{"success":true,"data":[{"id":26,"name":"A","comment":"","start_time_plan":null,"start_time_actual":"2016-09-13 00:00:00","start_time_delta":null,"start_time_score":null,"start_time_score_achievement":null,"start_time_traffic_light":null,"end_time_plan":null,"end_time_actual":"2016-09-13 00:00:00","end_time_delta":null,"end_time_score":null,"end_time_score_achievement":null,"end_time_traffic_light":null,"status":0,"measure_schedule_revision_id":63,"responsible_user_id":3,"created_time":"2016-09-13 11:29:14","created_user_id":3,"modified_time":"2016-09-21 16:33:41","modified_user_id":3,"model":"Activity"},{"id":27,"name":"B","comment":"","start_time_plan":null,"start_time_actual":"2016-09-13 00:00:00","start_time_delta":null,"start_time_score":null,"start_time_score_achievement":null,"start_time_traffic_light":null,"end_time_plan":null,"end_time_actual":"2016-09-13 00:00:00","end_time_delta":null,"end_time_score":null,"end_time_score_achievement":null,"end_time_traffic_light":null,"status":0,"measure_schedule_revision_id":63,"responsible_user_id":3,"created_time":"2016-09-13 11:29:48","created_user_id":3,"modified_time":"2016-10-16 18:14:36","modified_user_id":1,"model":"Activity"}

我想獲得的start_time_delta和end_time_delta保持併產生一點點散點圖。但不知何故，我無法解碼JSON。

這裏是我做的：

#falcon api 
u = 'https://myurl.com' 

#urllib3 + poolmanager for requests 
import urllib3 
http = urllib3.PoolManager() 

import json 
r = http.request('GET', u) 
json.loads(r.data.decode('utf-8')) 

end = json.loads(r.data['end_time_delta']) 
start = json.loads(r.data['start_time_delta'])

這是我的錯誤：字節索引必須是整數或片，而不是str的

怎麼來的？我該如何解決這個問題？

來源

2016-11-27 Rachel

也可以考慮使用['requests'（HTTP：// docs.python-requests.org/en/master/）模塊，它可以自動處理池並提供一種非常簡單的方法來解析請求返回的JSON。 – pzp

您在這裏忽略的json.loads()返回值：

json.loads(r.data.decode('utf-8'))

然後，您嘗試在同一原始再次解碼，並嘗試使用它作爲解碼Python的結果。呼叫json.loads()一次，並使用所產生的Python字典：

result = json.loads(r.data.decode('utf-8')) 
start = result['data'][0]['start_time_delta'] 
end = result['data'][0]['end_time_delta']

因爲頂級詞典'data'關鍵點，一個列表結果，我以前0去第一的那些和提取數據你要。

如果你需要提取這些數據點每個字典在該列表中，你必須使用一個循環：

for entry in result['data']: 
    start = entry['start_time_delta'] 
    end = entry['end_time_delta'] 
    # do something with these two values, before iterating to the next

來源

2016-11-27 16:16:32

啊......我真是個傻瓜！謝謝！我想我現在可以通過JSON從'0'循環到'n'？ – Rachel

@Rachel：Python循環是foreach結構，當你直接訪問序列中包含的元素時，不需要使用索引。 –

如何用Python解碼JSON？

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