Question

所以，我想使用Kenneth'优秀的requests module。在尝试使用Freebase API时偶然发现了这个问题。

基本上，他们的API看起来像这样：

https://www.googleapis.com/freebase/v1/mqlread?query=...

作为一个查询，他们期望一个JSON对象，这里是return a list of wines with their country and percentage of alcohol：

[{
  "country":       null,
  "name":          null,
  "percentage_alcohol": null,
  "percentage_alcohol>": 0,
  "type":          "/food/wine"
}]

当然，在将它传递给URL之前，我们必须逃避这一点，所以实际的查询将如下所示：

 fullurl = 'https://www.googleapis.com/freebase/v1/mqlread?query=%5B%7B%22percentage_alcohol%3E%22%3A+0%2C+%22country%22%3A+null%2C+%22type%22%3A+%22%2Ffood%2Fwine%22%2C+%22name%22%3A+null%2C+%22percentage_alcohol%22%3A+null%7D%5D'

现在，

r = requests.get(fullurl)
print r.status_code
>>> 400

因为网站声称它无法解析查询。

r2 = urllib2.urlopen(fullurl)
print r2.getcode()
>>> 200

这里没问题，我得到了适当的回报。有趣的是，

# This is the url of our requests.get request
print urllib2.urlopen(r.url).getcode() 
>>> 200

为什么呢？我使用模块错了吗？或者它是requests中的错误？

Answer 1

它对我有用。这是我做的：

>>> params = [{"country": None,
...            "name": None,
...            "percentage_alcohol": None,
...            "percentage_alcohol>": 0,
...            "type": "/food/wine"
...          }]
>>> import json
>>> params_json = json.dumps(params)

>>> import requests
>>> url = "https://www.googleapis.com/freebase/v1/mqlread?query=%s"
>>> r = requests.get(url % params_json)
>>> r.status_code
200

>>> content_json = json.loads(r.content)
>>> import pprint
>>> pprint.pprint(content_json)
{u'result': [{u'country': u'New Zealand',
              u'name': u'2003 Cloudy Bay Sauvignon Blanc',
              u'percentage_alcohol': 13.5,
              u'type': u'/food/wine'},
             {u'country': u'France',
              u'name': u'G.H. Mumm Cordon Rouge Brut',
              u'percentage_alcohol': 12.0,
              u'type': u'/food/wine'},
....

为了简洁起见，我把剩下的休息了。有100个结果。 requests.__version__ == '0.10.6'

将JSON对象传递给包含请求的URL

1 个答案: