url(r'json/(?P<data_type>full|half|third)/(?P<year>[0-9]{4})-(?P<month>[0-9]{1,2})', data, name='data'),
url(r'plot/((?P<data_type>full|half|third)/(?P<year>[0-9]{4})-(?P<month>[0-9]{1,2})', plot, name='plot'),

def plot(request, year, month, data_type):
    context = {
        "year": year,
        "month": month,
        "data_type": data_type
}
return render(request, 'plot.html', context=context)

var year = "{{ year }}";
var month = "{{ month }}";
var data_type = "{{ data_type }}";

d3.json("{% url "data" part %}".replace("part", data_type.toStrint()+"/"+year.toString()+"-"+month.toString()), function(data){

// chart code which works

};