Upgrades

you could add a simple query to enter an address instead of coordinates.

I used nominatim :

def nominatim(address):
    """
    transfrom address in lat long coordinates
    """
    url = "http://nominatim.openstreetmap.org/search"
    address = address.replace(" ","+")
    format="jsonv2"
    addressdetails="0"
    polygon_="0"
    limit="1"
    url_totale = url+"?q="+address+"&format="+format+"&addressdetails="+addressdetails+"&polygon_="+polygon_+"&limit="+limit
    request = urllib.urlopen(url_totale)
    try:
        results = json.load(request)
        if 0 < len(results):
            r = results[0]
            return float(r['lat']),float(r['lon'])
        else:
            print 'HTTP GET Request failed.'
    except ValueError, e:
        print 'JSON decode failed: '+str(request)

#EXAMPLE
#a = nominatim("133 rue saint antoine Paris")
#print a['display_name']
#print a['lat']
#print a['lon']