A Simple Pinging API, to make calls to Google Geolocation API per second

google_calls.py

#!/usr/bin/python

###############################################################################################
#
# Basic Pinging API, to make calls to Google Geolocation API per second
# Uses Ratelimiting, for limiting the calls to one second only...
#
# * This app, uses a `.json` file [calls.json], for getting Lat/Lons, that needs to be 
#   reversegeocoded using the Google API...
# * Uses Formatter, to format String, as required...
# * I don't remember, but I required ascii convertion of json data (which is by default 
#   unicode)
#
###############################################################################################

import urllib, json, string
from pprint import pprint
# Download this library before using this Sample Code...
from ratelimit import *


class PartialFormatter(string.Formatter):
    def __init__(self, missing='~~', bad_fmt='!!'):
        self.missing, self.bad_fmt=missing, bad_fmt

    def get_field(self, field_name, args, kwargs):
        # Handle a key not found
        try:
            val=super(PartialFormatter, self).get_field(field_name, args, kwargs)
            # Python 3, 'super().get_field(field_name, args, kwargs)' works
        except (KeyError, AttributeError):
            val=None,field_name 
        return val 

    def format_field(self, value, spec):
        # handle an invalid format
        if value==None: return self.missing
        try:
            return super(PartialFormatter, self).format_field(value, spec)
        except ValueError:
            if self.bad_fmt is not None: return self.bad_fmt   
            else: raise

def ascii_encode_dict(data):
    ascii_encode = lambda x: x if type(x) == float else x.encode('ascii')
    return dict(map(ascii_encode, pair) for pair in data.items())

rows = ""
with open('calls.json') as data_file:    
    rows = json.load(data_file)

latlon = [ascii_encode_dict(i) for i in rows['rows']];
url = "http://maps.googleapis.com/maps/api/geocode/json?latlng={latitude},{longitude}&sensor=false"
fmt = PartialFormatter()

@rate_limited(1)
def call_google(url):
	response = urllib.urlopen(url)
	data = json.loads(response.read())
	print data

for dat in latlon:
	call_google(fmt.format(url, **dat))
	

Json File should have a following format:

{
    "rows": [
        {
            "latitude": "{Latitude as Number}",
            "longitude": "{Longitude as Number}"
         }
     ]
}