TypeError：字符串索引必须是带有JSON的整数

问题描述

我正在测试一个烧瓶应用程序，我需要发布一些关键值对，但我的烧瓶应用程序正在期待他们在JSON格式。在命令行我创建了json从我的kv对像这样：

import json
>>>打印json.dumps（{'4'：5，'6'：7}，sort_keys = True，indent = 4，separators =（'，'，'：'））
{
4 ：5，
6：7
}

这变成邮递员：

并发布到我得到的应用程序：

$ p $ TypeError：字符串索引必须是整数



$ p $ [{
4：5，
6：7
}]

有用！为什么会发生这种情况？

以下是应用程序代码。错误发生在最后一行：

$ $ p $ json = request.get_json（force = True）＃接收来自php $ b的请求$ b为j在json中：
print str（j）

test = [{'ad'：j ['4']，'token'：j ['6']}对于j中的json]

解决方案

list dict s因为你的代码试图处理一个列表的列表。这个问题与json无关，恰好是你在数据结构中读取的方式。这是您的代码作为演示问题的单个脚本。为了避免与 json 混淆，我将名称改为 data ，并使用 repr 而不是 str 来清除问题。

  data = {'4'：5，'6'：7} 
 
 for data in data：
 print repr（j）
 
 test = [ {'ad'：j ['ad']，'token'：j ['token']} for j in data] 
  

$ p


$ b $ 6 $

$ b $ p $ （最近的最后一次调用）：
在< module>文件中的第6行x.py
test = [{'ad'：j ['ad']，'token'：j ['token']} for data in data]
TypeError：字符串索引必须是整数，而不是str

您的print语句显示迭代 data 产生字符串，所以 j ['token'] 将会失败。从你的代码的外观看，你似乎想创建一个列表中的字典列表作为输入。而且一旦你把输入的字典放在一个列表中，它就会崩溃，因为这些字典没有你要求的密钥...但是更接近！

I am testing a flask app where I need to post some key value pairs, but my flask app is expecting them in JSON format. At the command line I created json from my kv pairs like so:

>>> import json
>>> print json.dumps({'4': 5, '6': 7}, sort_keys=True,indent=4, separators=(',', ': '))
{
    "4": 5,
    "6": 7
}

when I put this into postman:

and post it to my app I get:

TypeError: string indices must be integers

However if I use:

[{
    "4": 5,
    "6": 7
}]

It works! Why is this happening?

Here is the app code. the error is happening at the last line:

json = request.get_json(force=True) # receives request from php
for j in json:
        print str(j)

test = [{'ad': j['4'], 'token':j['6']} for j in json]

解决方案

You need to pass in a list of dicts because your code tries to process a list of dicts. The problem isn't related to json, that just happens to be how you read in the data structure. Here's your code as a single script demonstrating the problem. I changed the name to data to avoid confusion with json and I'm using repr instead of str to keep the problem clear.

data = {'4': 5, '6': 7}

for j in data:
        print repr(j)

test = [{'ad': j['ad'], 'token':j['token']} for j in data]

Running this results in

'4'
'6'
Traceback (most recent call last):
  File "x.py", line 6, in <module>
    test = [{'ad': j['ad'], 'token':j['token']} for j in data]
TypeError: string indices must be integers, not str

Your print statement shows that iterating through data produces strings so it makes sense that j['token'] will fail. From the looks of your code, it seems like you want to create a list of dicts from a list of dicts as input. And once you put the input dicts in a list, it ... well crashes because the dicts don't have the keys you claim... but is closer!

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