使用 Python 从 json 数据中删除 'u'

Question

我有一个 Python 代码，基本上从 Amazon SQS 中提取数据，我需要将此 JSON 数据索引到 Elasticsearch。目前我的代码如下：

import os
import json
import uuid
import time
import boto.sqs
import boto
from boto.sqs.connection import SQSConnection
from boto.sqs.message import Message
from boto.sqs.message import RawMessage
from ConfigParser import SafeConfigParser
import ast

parser = SafeConfigParser()
parser.read('/home/ubuntu/config.ini')

#get details via config file

region = parser.get('default', 'aws_region')
access_key = parser.get('default', 'aws_access_key')
secret_key = parser.get('default', 'aws_secret_key')
queue_name = parser.get('default', 'sqs_queue_name')

sqs = boto.sqs.connect_to_region(region,aws_access_key_id=access_key,aws_secret_access_key=secret_key)
q = sqs.get_queue(queue_name) #SQS queue name

m = q.read(visibility_timeout=15)
if m == None:
  print "No message!"
else:
    a = m.get_body()
    print a
    print type(a)

    new_list = json.loads(a)
    print new_list
    print type(new_list)

这会产生如下结果：

{
    "facter": {
        "blockdevice_xvda_size": 8589934592,
        "blockdevices": "xvda,xvdb",
        "fqdn": "ip-1-12-5-9.us-west-2.compute.internal",
        "hardwaremodel": "x86_64",
        "hostname": "ip-1-12-5-9",
        "instanceid": "i-a54d7c",
        "ipaddress": "1.12.5.9",
        "is_virtual": "true",
        "kernelrelease": "3.13.0-48-generic",
        "lsbdistcodename": "trusty",
        "lsbdistdescription": "Ubuntu 14.04.2 LTS",
        "macaddress": "2:00:a:66:61:4f",
        "memoryfree": "3.56 GB",
        "memorytotal": "3.68 GB",
        "netmask": "255.255.255.12",
        "operatingsystem": "Ubuntu",
        "operatingsystemrelease": "14.04",
        "processor0": "Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz",
        "processorcount": "1",
        "timezone": "UTC",
        "uniqueid": "660a4f41",
        "uptime": "23:36 hours"
    }
}
<type 'unicode'>
{u'facter': {u'kernelrelease': u'3.13.0-48-generic', u'memoryfree': u'3.56 GB', u'memorytotal': u'3.68 GB', u'processorcount': u'1', u'timezone': u'UTC', u'operatingsystem': u'Ubuntu', u'uptime': u'23:36 hours', u'hostname': u'ip-1-12-5-9', u'is_virtual': u'true', u'blockdevices': u'xvda,xvdb', u'hardwaremodel': u'x86_64', u'netmask': u'255.255.255.192', u'blockdevice_xvda_size': 8589934592, u'uniqueid': u'660a4f41', u'ipaddress': u'10.102.65.79', u'lsbdistdescription': u'Ubuntu 14.04.2 LTS', u'macaddress': u'2:00:a:66:41:4f', u'operatingsystemrelease': u'14.04', u'processor0': u'Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz', u'instanceid': u'i-a54d7c', u'fqdn': u'ip-1-12-5-9.us-west-2.compute.internal', u'lsbdistcodename': u'trusty'}}
<type 'dict'>

如您所见，它是一个具有 unicode 的字典。我需要从这个字典中提取 "instanceid" 并使用它在 ES 中对其进行索引。我坚持如何提取索引 ID。我试过了：

 ast.literal_eval(json.dumps())

我到底做错了什么？

Answer 1

因为 new_list 是一个 dict 你应该可以用一个简单的

来提取它

instanceid = new_list['facter']['instanceid']

您在字符串之前看到的 u 只是告诉您这些字符串是 unicode 字符串，而不是 "C-string"。在你的情况下没关系，因为在任何字典键中都没有 unicode 字符。

使用 Python 从 json 数据中删除 'u'

Remove 'u' from json data using Python

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