python的json解析函数不支持单引号字符串

xuyangus

　　使用python标准库的json解析函数json.loads是不能使用单引号引用的json字符串，示例如下：
　　改用双引号，或者在loads之前先调用json.dumps(a)也可以。

>>> a = "{'aa':'dd','dd':'df'}"
>>> import json
>>> b = json.loads(a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python2.6/json/__init__.py", line 307, in loads
return _default_decoder.decode(s)
File "/usr/lib64/python2.6/json/decoder.py", line 319, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python2.6/json/decoder.py", line 336, in raw_decode
obj, end = self._scanner.iterscan(s, **kw).next()
File "/usr/lib64/python2.6/json/scanner.py", line 55, in iterscan
rval, next_pos = action(m, context)
File "/usr/lib64/python2.6/json/decoder.py", line 171, in JSONObject
raise ValueError(errmsg("Expecting property name", s, end))
ValueError: Expecting property name: line 1 column 1 (char 1)
>>> a = '{"aa":"asdf","dd":"dfads"}
File "<stdin>", line 1
a = '{"aa":"asdf","dd":"dfads"}
^
SyntaxError: EOL while scanning string literal
>>> a = '{"aa":"asdf","dd":"dfads"}'
>>> b = json.loads(a)
>>> b
>>> {u'aa': u'asdf', u'dd': u'dfads'}