Summary

We've gone from simple inheritance, one of the most useful tools in the object-oriented programmer's toolbox, all the way through to multiple inheritance, one of the most complicated. We learned how to:

• Add functionality to existing classes and built-ins using inheritance

• Share similar code between classes by abstracting it into a parent class

• Combine multiple threads of functionality using multiple inheritance

• Call parent methods using super

• Format argument lists in multiple inheritance so super doesn't choke

In the next chapter, we'll cover the subtle art of handling exceptional circumstances.