使用Python解析JSON：TypeError：list indices必须是整数,而不是

> author_id
> created_at
>公众

Python代码看起来像;

import json
import requests

# Set the request parameters
url = 'https:<MYURL.json'
user = 'MY_USER'
pwd = 'MY_PWD'

# Do the HTTP get request
response = requests.get(url,auth=(user,pwd))

# Check for HTTP codes other than 200
if response.status_code != 200: 
print('Status:',response.status_code,'Problem with the request. Exiting.')
exit()

# Decode the JSON response
data = response.json()

# Print each value

field_list = data['audits']
for fields in field_list:
print(fields['author_id'])
print(fields['created_at'])
print(fields['events']['public'])
print 'n'

我的代码错误：

File "get_ticket_updates.py",line 27,in <module>
print(fields['events']['public'])
TypeError: list indices must be integers,not str

我得到public的值是一个字符串,它需要是整数所以,我怎么能用这个？

数据看起来像：

{

"audits": [
    {

        "id": 20994687984,"ticket_id": ####,"created_at": "2014-09-15T16:30:11Z","author_id": 312016568,"via": {
            "channel": "email","source": {
                "from": {
                    "address": "email@domain.com","name": "user name","original_recipients": [
                        "email@domain.com","email@domain.com"
                    ]
                },"to": {
                    "address": "email@domain.com","name": "My Portal"
                },"rel": null
            }
        },},{
        "id": 20994845144,"created_at": "2014-09-15T16:32:18Z","author_id": 233915468,"via": {
            "channel": "web","source": {
                "from": {},"to": {},"events": [
            {
                "id": 20994845154,"type": "Comment","body": "<SOME TEXT>","public": true,"attachments": []
            },