解析Python JSON请求会引发ValueError

我正在尝试加载一个JSON字符串，该字符串是使用

requests

模块远程获取的。内容已成功检索，但当我尝试将其加载到dict中时，出现以下错误：

ValueError:无法解码任何JSON对象

# -*- coding: utf-8 -*-
import requests, json

url = 'some-url.com'
data = {} # dict with actual content
headers = {'content-type': 'application/json', 'accept': 'application/json'}

r = requests.post(url, data=json.dumps(data), headers=headers)

print r.json() # this line causes the error

以下是响应标题供参考：

{'content-length': '14411', 'x-powered-by': 'ASP.NET', 'server': 'Microsoft-IIS/7.5', 'cache-control': 'private', 'date': 'Thu, 19 Jun 2014 00:37:36 GMT', 'access-control-allow-origin': '*', 'content-type': 'application/json; charset=utf-8'}

编辑：

r.text的内容

{"columns":[{"code":"Region","text":"region","type":"d"},{"code":"Tid","text":"år","type":"t"},{"code":"BE0101N1","text":"Folkmängd","type":"c"}],"comments":[{"variable":"Region","value":"03","comment":"Fr o m 2007-01-01 utökas Uppsala län med Heby kommun. Observera att länssiffrorna inte är jämförbara med länssiffrorna bakåt i tiden.\r\n"},{"variable":"Region","value":"0330","comment":"Ny regional indelning fr.o.m. 2003-01-01. Delar av Uppsala kommun bildar en ny kommun benämnd Knivsta kommun.\r\n"},{"variable":"Region","value":"0331","comment":"Fr o m 2007-01-01 överförs Heby kommun från Västmanlands län till Uppsala län. Hebys kommunkod ändras från 1917 till 0331.\r\n"},{"variable":"Region","value":"0380","comment":"Ny regional indelning fr.o.m. 2003-01-01. Delar av Uppsala kommun bildar en ny kommun benämnd Knivsta kommun.\r\n"},{"variable":"Region","value":"19","comment":"Fr o m 2007-01-01 minskar Västmanlands län med Heby kommun. Observera att länssiffrorna inte är jämförbara med länssiffrorna bakåt i tiden.\r\n"}],"data":[{"key":["00","2013"],"values":["9644864"]},{"key":["01","2013"],"values":["2163042"]},{"key":["0114","2013"],"values":["41449"]},{"key":["0115","2013"],"values":["31616"]},{"key":["0117","2013"],"values":["40495"]},{"key":["0120","2013"],"values":["39784"]},{"key":["0123","2013"],"values":["69167"]},{"key":["0125","2013"],"values":["26355"]},{"key":["0126","2013"],"values":["102557"]},{"key":["0127","2013"],"values":["87580"]},{"key":["0128","2013"],"values":["16001"]},{"key":["0136","2013"],"values":["80932"]},{"key":["0138","2013"],"values":["44281"]},{"key":["0139","2013"],"values":["24703"]},{"key":["0140","2013"],"values":["9523"]},{"key":["0160","2013"],"values":["66292"]},{"key":["0162","2013"],"values":["32222"]},{"key":["0163","2013"],"values":["68145"]},{"key":["0180","2013"],"values":["897700"]},{"key":["0181","2013"],"values":["91072"]},{"key":["0182","2013"],"values":["94423"]},{"key":["0183","2013"],"values":["42626"]},{"key":["0184","2013"],"values":["72740"]},{"key":["0186","2013"],"values":["45178"]},{"key":["0187","2013"],"values":["11188"]},{"key":["0188","2013"],"values":["56845"]},{"key":["0191","2013"],"values":["43372"]},{"key":["0192","2013"],"values":["26796"]},{"key":["03","2013"],"values":["345481"]},{"key":["0305","2013"],"values":["19968"]},{"key":["0319","2013"],"values":["9132"]},{"key":["0330","2013"],"values":["15580"]},{"key":["0331","2013"],"values":["13450"]},{"key":["0360","2013"],"values":["20144"]},{"key":["0380","2013"],"values":["205199"]},{"key":["0381","2013"],"values":["40656"]},{"key":["0382","2013"],"values":["21352"]},{"key":["04","2013"],"values":["277569"]},{"key":["0428","2013"],"values":["8835"]},{"key":["0461","2013"],"values":["10409"]},{"key":["0480","2013"],"values":["53038"]},{"key":["0481","2013"],"values":["11403"]},{"key":["0482","2013"],"values":["16156"]},{"key":["0483","2013"],"values":["32930"]},{"key":["0484","2013"],"values":["99729"]},{"key":["0486","2013"],"values":["33389"]},{"key":["0488","2013"],"values":["11680"]},{"key":["05","2013"],"values":["437848"]},{"key":["0509","2013"],"values":["5174"]},{"key":["0512","2013"],"values":["3617"]},{"key":["0513","2013"],"values":["9802"]},{"key":["0560","2013"],"values":["5278"]},{"key":["0561","2013"],"values":["11460"]},{"key":["0562","2013"],"values":["20903"]},{"key":["0563","2013"],"values":["7585"]},{"key":["0580","2013"],"values":["150202"]},{"key":["0581","2013"],"values":["133749"]},{"key":["0582","2013"],"values":["14195"]},{"key":["0583","2013"],"values":["42187"]},{"key":["0584","2013"],"values":["7383"]},{"key":["0586","2013"],"values":["26313"]},{"key":["06","2013"],"values":["341235"]},{"key":["0604","2013"],"values":["6375"]},{"key":["0617","2013"],"values":["9406"]},{"key":["0642","2013"],"values":["7039"]},{"key":["0643","2013"],"values":["10975"]},{"key":["0662","2013"],"values":["28713"]},{"key":["0665","2013"],"values":["13209"]},{"key":["0680","2013"],"values":["130798"]},{"key":["0682","2013"],"values":["29516"]},{"key":["0683","2013"],"values":["33155"]},{"key":["0684","2013"],"values":["10969"]},{"key":["0685","2013"],"values":["26419"]},{"key":["0686","2013"],"values":["16464"]},{"key":["0687","2013"],"values":["18197"]},{"key":["07","2013"],"values":["187156"]},{"key":["0760","2013"],"values":["9288"]},{"key":["0761","2013"],"values":["8059"]},{"key":["0763","2013"],"values":["12156"]},{"key":["0764","2013"],"values":["19280"]},{"key":["0765","2013"],"values":["15759"]},{"key":["0767","2013"],"values":["9515"]},{"key":["0780","2013"],"values":["85822"]},{"key":["0781","2013"],"values":["27277"]},{"key":["08","2013"],"values":["233874"]},{"key":["0821","2013"],"values":["5718"]},{"key":["0834","2013"],"values":["6879"]},{"key":["0840","2013"],"values":["14368"]},{"key":["0860","2013"],"values":["13635"]},{"key":["0861","2013"],"values":["12949"]},{"key":["0862","2013"],"values":["8964"]},{"key":["0880","2013"],"values":["63887"]},{"key":["0881","2013"],"values":["19489"]},{"key":["0882","2013"],"values":["26212"]},{"key":["0883","2013"],"values":["35867"]},{"key":["0884","2013"],"values":["15287"]},{"key":["0885","2013"],"values":["10619"]},{"key":["09","2013"],"values":["57161"]},{"key":["0980","2013"],"values":["57161"]},{"key":["10","2013"],"values":["152757"]},{"key":["1060","2013"],"values":["12902"]},{"key":["1080","2013"],"values":["63912"]},{"key":["1081","2013"],"values":["27871"]},{"key":["1082","2013"],"values":["31272"]},{"key":["1083","2013"],"values":["16800"]},{"key":["12","2013"],"values":["1274069"]},{"key":["1214","2013"],"values":["13332"]},{"key":["1230","2013"],"values":["22672"]},{"key":["1231","2013"],"values":["17114"]},{"key":["1233","2013"],"values":["33807"]},{"key":["1256","2013"],"values":["13687"]},{"key":["1257","2013"],"values":["9653"]},{"key":["1260","2013"],"values":["14801"]},{"key":["1261","2013"],"values":["29600"]},{"key":["1262","2013"],"values":["22496"]},{"key":["1263","2013"],"values":["20067"]},{"key":["126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EDIT2：复制粘贴时工作

因此，如果我只是在终端中打印出

r.text

，复制文本并在Python解释器中运行

json.loads（text

），它会按预期工作。文件可能有错误吗

EDIT3:Simplejson错误

如果改用

simplejson

模块，则会得到一个更具描述性的错误：

simplejson.scanner.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

---

由于输出中存在未转义的

\r

，因此失败。我将您的完整输出复制到字符串

p

，并尝试通过

json运行它。加载

：

>>> json.loads(p)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/json/__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Invalid control character at: line 1 column 350 (char 349)
>>> p[349]
'\r'

您可以通过转义

\r

（以及

\n

，这也会显示）来修复它：

>>x=p.replace（“\r”、“\\r”）。replace（“\n”、“\\n”）
>>>json.loads（x）

我刚刚遇到了这个问题，它很烦人-在IPython中可以正常工作，如果您将响应文本保存到一个文件并加载它，则可以正常工作，我能找到的唯一与此相关的问题是处理不正确的

内容类型

标题的问题，而您没有这些标题

我发现有效的方法是使用

返回json.loads（str（req.content，“utf-8”））

---

这似乎是可行的，而且比将

req.text

写入一个文件，然后从那里加载JSON还要简单；）

你能打印出r的值吗？我的假设是r不包含JSON。打印r.text以便我们可以看到其中的内容。我将

r.text

的内容粘贴到JSON验证器中，并对其进行验证。不过，我已经用一个片段更新了这个问题。如果将r.text传递给json.loads，它是否有效？不，我得到的错误与

r.json（）

相同，json提供程序是一个非常值得信任的权威机构，因此我怀疑json输出是否有问题。无论如何，我尝试按照建议替换

\r

和

\s

，但仍然得到相同的错误。上述修复将中断正确转义的

\r

\n

>>> p[250:355]
' Heby kommun. Observera att l\xc3\xa4nssiffrorna inte \xc3\xa4r j\xc3\xa4mf\xc3\xb6rbara med l\xc3\xa4nssiffrorna bak\xc3\xa5t i tiden.\r\n"},{'

>>> x = p.replace("\r", "\\r").replace('\n', '\\n')
>>> json.loads(x)
<the huge json object prints here>