Looks cool but sample code doesn't work as marked on the page:

    Traceback (most recent call last):
      File "c:/temp/chart.py", line 6, in <module>
        chart.download('hello.png')
    AttributeError: 'SimpleLineChart' object has no attribute 'download'

Try 'download_graph' instead.

Still doesn't work for me, but that might be because we have a web proxy in place. Any suggestions? When I paste link into the browser it seems to work.