@register.simple_tag
def pie_chart(items, width=440, height=190):
    return '//chart.googleapis.com/chart?cht=p3&chd=t:{0}&chs={1}x{2}&chl={3}'.format(quote(','.join([str(item[1]) for item in items])), width, height, quote('|'.join([str(item[0]) for item in items])))
@register.simple_tag
def pie_chart(items, width=440, height=190):
    return '//chart.googleapis.com/chart?cht=p3&chd=t:{0}&chs={1}x{2}&chl={3}'.format(quote(','.join([str(item[1]) for item in items])), width, height, quote('|'.join([str(item[0]) for item in items])))