On Wed, Dec 23, 2009 at 5:27 PM, Albert-Jan Roskam <fo...@yahoo.com> wrote: > > I was studying the code on > http://matplotlib.sourceforge.net/examples/api/radar_chart.html. > Isn't it very unusual that a class is defined within a function?
Unusual, but not un-heard of. Usually the function is a factory function that returns the class to the caller. In this case the class is registered as the handler for projections of type 'radar'. Presumably RadarAxes is implementing a protocol (interface) that is required by register_projection(). > Why not use a class instance inside the function instead? Presumably register_projection() requires a class (strictly speaking, it probably requires a callable that returns an instance of a class that implements the required protocol). There don't seem to be any docs for register_projection() so it's hard to know for sure what it wants. > No methods of the class can currently be inherited outside the scope of the > function, right? Do you mean, the class cannot be subclassed? Not easily, only because the function doesn't return the class. There is no inherent reason this class could not be subclassed if a reference to the class were available. Kent _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
