Python打破了用字符解析json的问题

Question

我正在尝试使用转义字符解析json字符串(我想某种方式)

{
    "publisher": "\"O'Reilly Media, Inc.\""
}

如果我\"从字符串中删除字符,Parser解析得很好,

不同解析器引发的异常是,

JSON

  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: Expecting , delimiter: line 17 column 20 (char 392)

ujson

ValueError: Unexpected character in found when decoding object value

如何让解析器转义这个字符？

更新: PS.在这个例子中,json作为ujson导入

这就是我的想法

comma只是意外添加,它在json的末尾没有尾随逗号,json是有效的

字符串定义.

Answer 1

你几乎肯定没有定义正确的转义反斜杠.如果你正确定义字符串,JSON解析就好了:

>>> import json
>>> json_str = r'''
... {
...     "publisher": "\"O'Reilly Media, Inc.\""
... }
... '''  # raw string to prevent the \" from being interpreted by Python
>>> json.loads(json_str)
{u'publisher': u'"O\'Reilly Media, Inc."'}

请注意,我使用原始字符串文字来定义Python中的字符串; 如果我没有,那\"将由Python解释并"插入常规.否则你必须加倍反斜杠:

>>> print '\"'
"
>>> print '\\"'
\"
>>> print r'\"'
\"

将解析后的Python结构重新编码回JSON会显示反斜杠重新出现,repr()字符串的输出使用相同的双反斜杠:

>>> json.dumps(json.loads(json_str))
'{"publisher": "\\"O\'Reilly Media, Inc.\\""}'
>>> print json.dumps(json.loads(json_str))
{"publisher": "\"O'Reilly Media, Inc.\""}

如果你没有逃脱\逃脱,你最终会得到未转义的引号:

>>> json_str_improper = '''
... {
...     "publisher": "\"O'Reilly Media, Inc.\""
... }
... '''
>>> print json_str_improper

{
    "publisher": ""O'Reilly Media, Inc.""
}

>>> json.loads(json_str_improper)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/json/__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/json/decoder.py", line 382, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting , delimiter: line 3 column 20 (char 22)

请注意,\"序列现在打印为",反斜杠消失了!