Python解析json之ValueError: Expecting property name enclosed in double quotes: line 1 column 2（char 1）

Traceback (most recent call last): 
 
 File "<ipython-input-16-bff463ed9408>", line 1, in <module> 
 json.loads(r.text) 
 
 File "/Users/tonychen/anaconda2/lib/python2.7/json/__init__.py", line 339, in loads 
 return _default_decoder.decode(s) 
 
 File "/Users/tonychen/anaconda2/lib/python2.7/json/decoder.py", line 364, in decode 
 obj, end = self.raw_decode(s, idx=_w(s, 0).end()) 
 
 File "/Users/tonychen/anaconda2/lib/python2.7/json/decoder.py", line 380, in raw_decode 
 obj, end = self.scan_once(s, idx) 
 
ValueError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1) 

import json 
import requests 
 
user_agent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)" 
def get_header(): 
 return { 
  'User-Agent': user_agent, 
  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 
  'Accept-Language': 'en-US,en;q=0.5', 
  'Connection': 'keep-alive', 
  'Accept-Encoding': 'gzip, deflate', 
 } 
TEST_URL = 'http://ip.chinaz.com/getip.aspx' 
 
r = requests.get(url=TEST_URL, headers=get_header(), timeout=5) 
jsonstr = json.loads(r.text) 
 
print(jsonstr) 

u"{ip:'103.47.146.9',address:'\u4e9a\u592a\u5730\u533a '}" 

'{"key2": "val2", "key1": "val1"}'