通过URL从Python解析JSON

Question

So I'm trying to get json from a URl and the request works and I get the json but I'm not able to print specific things from it.

    request_url = 'http://api.tumblr.com/v2/user/following?limit=1'
    r = requests.get(request_url, auth=oauth).json()


    r["updated"]

I'm very new with python I'm guessing I need to get the json into a array but I have no idea where to even begin.

According to the tumblr api I should be able to get something like this.

    {
      "meta": {
        "status": 200,
        "msg": "OK"
      },
      "response": {
        "total_blogs": 4965,
        "blogs": [
          {
            "name": "xxxxx",
            "title": "xxxxxx",
            "description": "",
            "url": "http://xxxxxx.tumblr.com/",
            "updated": 1439795949
          }
        ]
      }
    }

I only need the name, url, and updated just no idea how to seperate that out.

Answer 1

You should be able to print values as though it were nested arrays:

r["response"]["blogs"][0]["updated"] should get you the updated bit, don't go straight to it. Just work your way down. Note how blogs is an array, so in a normal case you may actually want to work towards r["response"]["blogs"] , then loop through it and for each of those items, grab the ["updated"] .

Similarly, r["meta"]["msg"] will get you the meta message.

Answer 2

Just access the levels one by one.

for i in r["response"]["blogs"]:
    print i["name"],i["url"],i["updated"]

So this code can be used to print all the objects inside the blogs list

To explain how this works:

Json objects are decoded into something called dictionaries in Python. Dictionaries are simple key value pairs. In your example,

r is a dictionary with the following keys:

meta, response

You access the value of a key using r["meta"].

Now meta itself is a dictionary. The keys associated are:

status,msg

So, r["meta"]["status"] gives the status value returned by the request.

Answer 3

The JSON data gets converted as dict which is set to r as per your code.

For accessing the value associated with updated key, you need to first access the values before it.

You should first access r["response"] which contains the actual response of the api. From that level, you should next access r["response"]["blogs"] and then loop through that to find the value of the updated key.

If it is a single blog, you can do something like r["response"]["blogs"][0]["updated"]