If you want to iterate over both keys and values of the dictionary, do this:

for key, value in data.items():
    print(key, value)

Get data from the URL and then call json.loads e.g.

Python3 example:

import urllib.request, json 
with urllib.request.urlopen("http://maps.googleapis.com/maps/api/geocode/json?address=google") as url:
    data = json.loads(url.read().decode())
    print(data)

Python2 example:

import urllib, json
url = "http://maps.googleapis.com/maps/api/geocode/json?address=google"
response = urllib.urlopen(url)
data = json.loads(response.read())
print data

The output would result in something like this:

{
"results" : [
    {
    "address_components" : [
        {
            "long_name" : "Charleston and Huff",
            "short_name" : "Charleston and Huff",
            "types" : [ "establishment", "point_of_interest" ]
        },
        {
            "long_name" : "Mountain View",
            "short_name" : "Mountain View",
            "types" : [ "locality", "political" ]
        },
        {
...

Use json.loads it will convert the json string to a dict containing dicts, list, etc.

Edit 2: You can access each item like this: json_object['scans']['TotalDefense']['version'] contd. But you may also need to json.loads(json.load(response)) as I mentioned in my comment below.

Edit 1: In your example, we should not be seeing "scans" again for print json_object['scans'].

From http://docs.python.org/library/json.html:

>>> import json
>>> json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]')
[u'foo', {u'bar': [u'baz', None, 1.0, 2]}]

That page also has info on how to do more complex decoding.