Python 将字典转换为 JSON
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Converting dictionary to JSON
提问by sheetal_158
r = {'is_claimed': 'True', 'rating': 3.5}
r = json.dumps(r)
file.write(str(r['rating']))
I am not able to access my data in the JSON. What am I doing wrong?
我无法访问 JSON 中的数据。我究竟做错了什么？
TypeError: string indices must be integers, not str
采纳答案by Iman Mirzadeh
json.dumps()converts a dictionary to strobject, not a json(dict)object! So you have to load your strinto a dictto use it by using json.loads()method
json.dumps()将字典转换为str对象，而不是json(dict)对象！所以你必须通过使用方法将你的加载str到 adict中使用它json.loads()
See json.dumps()as a save method and json.loads()as a retrieve method.
见json.dumps()的保存方法，并json.loads()作为检索方法。
This is the code sample which might help you understand it more:
这是代码示例，可以帮助您更多地理解它：
import json
r = {'is_claimed': 'True', 'rating': 3.5}
r = json.dumps(r)
loaded_r = json.loads(r)
loaded_r['rating'] #Output 3.5
type(r) #Output str
type(loaded_r) #Output dict
回答by Tim
json.dumps()returns the JSON string representation of the python dict. See the docs
json.dumps()返回 python 字典的 JSON 字符串表示。查看文档
You can't do r['rating']because r is a string, not a dict anymore
你不能这样做，r['rating']因为 r 是一个字符串，而不是一个字典了
Perhaps you meant something like
也许你的意思是
r = {'is_claimed': 'True', 'rating': 3.5}
json = json.dumps(r) # note i gave it a different name
file.write(str(r['rating']))
回答by user3273866
No need to convert it in a string by using json.dumps()
无需使用将其转换为字符串 json.dumps()
r = {'is_claimed': 'True', 'rating': 3.5}
file.write(r['is_claimed'])
file.write(str(r['rating']))
You can get the values directly from the dict object.
您可以直接从 dict 对象中获取值。
回答by Aslan
Defining r as a dictionary should do the trick:
将 r 定义为字典应该可以解决问题：
>>> r: dict = {'is_claimed': 'True', 'rating': 3.5}
>>> print(r['rating'])
3.5
>>> type(r)
<class 'dict'>
