python中json对象转换出错解决方法

接收一个post的json字符串:

s={"username":"admin","password":"password","tenantid":""}

使用python自带的json库

import json
>>> a=json.loads(s)
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python2.7/json/__init__.py", line 326, 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())
TypeError: expected string or buffer
>>>

错！

百思不得其解。经过调试，最终发现，python中默认使用单引号表示字符串"&＃39;"

所以当，用字符串符值以后，python会把双引号转换为单引号

>>> s={"username":"admin","password":"password","tenantid":""}

>>> print s

{&＃39;username&＃39;: &＃39;admin&＃39;, &＃39;password&＃39;: &＃39;password&＃39;, &＃39;tenantid&＃39;: &＃39;&＃39;}

而json是不支持单引号的。

可以用下面的方法转换

json_string=json.dumps(s)

python_obj=json.loads(json_string)

ok，问题解决