In Han Kang wrote:
> So each of the sub classes plots a different type of graph. The
> superclass defines methods that are the same for all the plots. I want
> to be able to pick some points and be able to generate a more plots.
> What I was wondering if I could define in a method in the superclass of
> an object the ability to make a brand new subclass (new plot). So
> basically, one plot makes another plot, but it'd be nice if i could put
> all the code in the superclass.
Right, I agree with Steven, that you are probably wanting something like
the factory pattern. Here's something modified from Steven's example
more like what you are asking for:
class Plot(object): #you need to subclass object to get __subclasses__
@staticmethod
def getplot(name):
return [plot for plot in
Plot.__subclasses__() if plot.__name__ == name][0]()
class LinePlot(Plot):
pass
class BarGraph(Plot):
pass
lp = Plot.getplot("LinePlot")
bar = Plot.getplot("BarGraph")
See also: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/86900
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