如何訪問json數據中的特定文本？ [巨蟒]

Question

我需要從這個JSON數據訪問文本屬性，所以我可以結束有：

{'description': {'tags': ['outdoor', 'building', 'street', 'city', 'busy', 'people', 'filled', 'traffic', 'many', 'table', 'car', 'group', 'walking', 'bunch', 'crowded', 'large', 'night', 'light', 'standing', 'man', 'tall', 'umbrella', 'riding', 'sign', 'crowd'], 'captions': [{'text': 'a group of people on a city street filled with traffic at night', 'confidence': 0.8241405091548035}]}, 'requestId': '12fd327f-9b9c-4820-9feb-357a776211d3', 'metadata': {'width': 1826, 'height': 2436, 'format': 'Jpeg'}} 
text = "The Text" 

我是否嘗試過做解析[「標題」] [「文本」]，但這沒有工作。請讓我知道你是否可以幫忙謝謝！

Answer 1

這裏有兩個問題。首先，captions是description下，二，text是名單內的字典的鍵（第一和唯一的項目）：

>>> import pprint 
>>> pprint.pprint(parsed) 
{'description': {'captions': [{'confidence': 0.8241405091548035, 
           'text': 'a group of people on a city street filled with traffic at night'}], 
... 

所以，你可以提取text這樣的：

>>> parsed['description']['captions'][0]['text'] 
'a group of people on a city street filled with traffic at night' 

---

另一個選擇可能是使用簡化遍歷這樣JSON結構第三方庫，例如plucky（全面披露：我是作者）。隨着plucky，你可以說：

>>> from plucky import pluckable 
>>> pluckable(parsed).description.captions.text 
['a group of people on a city street filled with traffic at night'] 

，而不用擔心裏面列出了字典。

Answer 2

你可以在這裏使用Python的JSON庫，像下面 -

import json 

your_json_string = "{'description': {'tags': ['outdoor', 'building', 'street', 'city', 'busy', 'people', 'filled', 'traffic', 'many', 'table', 'car', 'group', 'walking', 'bunch', 'crowded', 'large', 'night', 'light', 'standing', 'man', 'tall', 'umbrella', 'riding', 'sign', 'crowd'], 'captions': [{'text': 'a group of people on a city street filled with traffic at night', 'confidence': 0.8241405091548035}]}, 'requestId': '12fd327f-9b9c-4820-9feb-357a776211d3', 'metadata': {'width': 1826, 'height': 2436, 'format': 'Jpeg'}}" 
data_dict = json.loads(your_json_string) 
print(data_dict['description']['captions'][0]['text'])