final

#!/usr/bin/env python
import urllib2
import json


class GetJSONFromURL():
    def __init__(self):
        self.lastID = 0

    def flatten_dict(self,dd, separator='_', prefix=''):
        return { prefix + separator + k if prefix else k : v
                 for kk, vv in dd.items()
                 for k, v in self.flatten_dict(vv, separator, kk).items()
                 } if isinstance(dd, dict) else { prefix : dd }

    def parse_dict(self,init, lkey=''):
        ret = {}
        for rkey,val in init.items():
            key = lkey+rkey
            if isinstance(val, dict):
                ret.update(self.parse_dict(val, key+'_'))
            #  This bit added in to deal with elements of JSON that are lists
            elif isinstance(val, list):
                for listitem in val:
                    ret.update(self.parse_dict({key + str(val.index(listitem)) : listitem},  ''))
            #  end of my addition following your prompt :)
            else:
                ret[key] = val
        return ret

    # retrieve and load the JSON data into a JSON object
    def getJSON(self, url):
        jdata = '{"coord":{"lon":-2.62,"lat":53.65},"weather":[{"id":300,"main":"Drizzle","description":"light intensity drizzle","icon":"09n"},{"id":741,"main":"Fog","description":"fog","icon":"50n"}],"base":"stations","main":{"temp":277.14,"pressure":1009,"humidity":100,"temp_min":276.15,"temp_max":278.15},"visibility":10000,"wind":{"speed":5.1,"deg":160},"clouds":{"all":40},"dt":1486450200,"sys":{"type":1,"id":5098,"message":0.0029,"country":"GB","sunrise":1486453471,"sunset":1486487131},"id":2653086,"name":"Chorley","cod":200} '

        feedData = jdata
        #jsonFeed = urllib2.urlopen(url)
        #feedData = jsonFeed.read()
        #print feedData
        #jsonFeed.close()
        data = json.loads(feedData)
        #return self.parse_dict(data)
        return self.parse_dict(data)

j=GetJSONFromURL()

msg = j.getJSON("test")

for x in msg.items():
    print x