将字符串转换为字典 python

Question

我想从以下内容创建一个字典：

 >>> page_detail_string = urllib2.urlopen("http://graph.facebook.com/Ideas4India").read()

它返回一个像这样的字符串：

>>> page_detail_string
'{"about":"Ideas for development of India","category":"Community","description":"Platform where you can discuss and share your ideas which you think might help in betterment of our country.\\nPlease respect other community members and do not talk politics here.","is_published":true,"talking_about_count":0,"username":"Ideas4India","were_here_count":0,"id":"250014455083430","name":"Ideas 4 India","link":"http:\\/\\/www.facebook.com\\/Ideas4India","likes":23}'

现在我想把它转换成字典，这可以通过使用 ast.literal_eval 很简单地做到。

>>> import ast
>>> dict_page = ast.literal_eval(page_detail_string)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/ast.py", line 80, in literal_eval
return _convert(node_or_string)
File "/usr/lib/python2.7/ast.py", line 63, in _convert
in zip(node.keys, node.values))
File "/usr/lib/python2.7/ast.py", line 62, in <genexpr>
return dict((_convert(k), _convert(v)) for k, v
File "/usr/lib/python2.7/ast.py", line 79, in _convert
raise ValueError('malformed string')

但是我觉得它抛出这个错误是因为：

"is_published":true

有没有办法让我通过去掉上面的键和值（"is_published":true）来转换成字典呢？

谢谢

Answer 1

使用 json模块：

In [1]: s = '{"about":"Ideas for development of India","category":"Community","description":"Platform where you can discuss and share your ideas which you think might help in betterment of our country.\\nPlease respect other community members and do not talk politics here.","is_published":true,"talking_about_count":0,"username":"Ideas4India","were_here_count":0,"id":"250014455083430","name":"Ideas 4 India","link":"http:\\/\\/www.facebook.com\\/Ideas4India","likes":23}'

In [2]: import json

In [3]: json.loads(s)
Out[3]: 
{u'about': u'Ideas for development of India',
 u'category': u'Community',
 u'description': u'Platform where you can discuss and share your ideas which you think might help in betterment of our country.\nPlease respect other community members and do not talk politics here.',
 u'id': u'250014455083430',
 u'is_published': True,
 u'likes': 23,
 u'link': u'http://www.facebook.com/Ideas4India',
 u'name': u'Ideas 4 India',
 u'talking_about_count': 0,
 u'username': u'Ideas4India',
 u'were_here_count': 0}

另外，注意你可以直接在文件对象上使用 json.load（而不是 json.loads）：

In [4]: import urllib2

In [5]: json.load(urllib2.urlopen("http://graph.facebook.com/Ideas4India"))
Out[5]: 
{u'about': u'Ideas for development of India',
 u'category': u'Community',
 u'description': u'Platform where you can discuss and share your ideas which you think might help in betterment of our country.\nPlease respect other community members and do not talk politics here.',
 u'id': u'250014455083430',
 u'is_published': True,
 u'likes': 23,
 u'link': u'http://www.facebook.com/Ideas4India',
 u'name': u'Ideas 4 India',
 u'talking_about_count': 0,
 u'username': u'Ideas4India',
 u'were_here_count': 0}

Answer 2

使用 json 模块

import json
json.loads(page_detail_string)

想了解更多关于 json 模块的内容，可以查看这个链接：http://docs.python.org/2/library/json.html

Answer 3

你得到的是一个json字符串，你应该使用json.loads来把它转换成字典。

import json
json.loads(page_detail_string)