[英]Extracting certain data from json
https://www.huobi.com/p/api/contents/
您好,我想從此api中提取所有標題,並查看標題中是否有任何更改。.我該如何使用python呢?
我收到此錯誤:
before_set = before['data']['items']['title']
TypeError: list indices must be integers or slices, not str
這是我的代碼:
import requests
import json
try:
with open('notice.json', 'r') as current_notice:
before = json.loads(current_notice.read())
except IOError:
before = requests.get('https://www.huobi.com/p/api/contents/').json()
with open('notice.json', 'w') as current_notice:
current_notice.write(json.dumps(before))
print("First run....")
after = requests.get('https://www.huobi.com/p/api/contents/').json()
before_set = before['data']['items']['title']
after_set = after['data']['items']['title']
new_set = after_set - before_set
while True:
try:
if not new_set:
print("No change... Exiting.")
if new_set:
print("There are changes")
except Exception as e:
print(e)
pass
before['data']['items']
包含before['data']['items']
是一個列表。 您將使用以下命令訪問第一項的標題:
before['data']['items'][0]['title']
要獲取所有標題,可以使用列表理解:
before_set = [item['title'] for item in before['data']['items']]
您具有ID列表以實現最佳可視化效果,我建議您將數據與ID進行比較,例如:
bitems = before.get('data', {}).get('items', [])
before_data = [(item.get('id'), item.get('title')) for item in bitems]
aitems = after.get('data', {}).get('items', [])
after_data = [(item.get('id'), item.get('title')) for item in aitems]
compare = set(before_data) ^ set(after_data)
print(compare)
這里的問題是response ['data'] ['items']以列表的形式出現
type(response['data']['items'])
<class 'list'>
您可以使用列表理解來解決此問題,也可以嘗試使用集合中的默認字典
這是因為before['data']['items']
具有多個項目,因此它返回一個數組
您可以像這樣遍歷列表:
for item in before['data']['items']:
print item['title']
或者您也可以將所有標題保存到一個變量中,例如:
titles = [item['title'] for item in before['data']['items']]
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