I think that this line:
im.save(f, .gif")
should be
im.save(f, ".gif")
Also, the last example URI:
http://bitworking.org/projects/sparklines/spark.cgi?type=smooth&d=10,20,30,90,80,70
should be:
http://bitworking.org/projects/sparklines/spark.cgi?type=discrete&d=10,20,30,90,80,70
Otherwise, very very cool.
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