详解python中的json的基本使用方法

#!/usr/bin/env python 
#-*- coding:utf-8 -*- 
import json 
 
print json.load(open('kel.txt')) 
#deserialize string or unicode to python object 
j = json.loads(open('kel.txt').read(),encoding='utf-8') 
print type(j),j 
for i in j: 
  print i 
k = json.dumps(j,encoding='utf-8').decode('utf-8') 
print k 

{ 
  "中文":"kel", 
  "fist":"kel" 
} 

{u'\u4e2d\u6587': u'kel', u'fist': u'kel'} 
<type 'dict'> {u'\u4e2d\u6587': u'kel', u'fist': u'kel'} 
中文 
fist 
{"\u4e2d\u6587": "kel", "fist": "kel"} 

[root@python 56]# python kel.py  
Traceback (most recent call last): 
 File "kel.py", line 5, in <module> 
  json.load(open('kel.txt')) 
 File "/usr/local/python/lib/python2.7/json/__init__.py", line 291, in load 
  **kw) 
 File "/usr/local/python/lib/python2.7/json/__init__.py", line 339, in loads 
  return _default_decoder.decode(s) 
 File "/usr/local/python/lib/python2.7/json/decoder.py", line 364, in decode 
  obj, end = self.raw_decode(s, idx=_w(s, 0).end()) 
 File "/usr/local/python/lib/python2.7/json/decoder.py", line 382, in raw_decode 
  raise ValueError("No JSON object could be decoded") 
ValueError: No JSON object could be decoded 

 { 
  "fist":'kel' 
} 

 #!/usr/bin/env python 
#-*- coding:utf-8 -*- 
import json 
j = json.loads(open('kel.txt').read()) 
print type(j),j