Looking forward

In the coming chapters, we'll make extensive use of these abstract base classes discussed in this chapter. In Chapter 5, Using Callables and Contexts, we'll look at the relatively simple features of callables and containers. In Chapter 6, Creating Containers and Collections, we'll look at the available containers and collections. We'll also look at building a unique, new kind of container in this chapter. Lastly, in Chapter 7, Creating Numbers, we'll look at various numeric types and how we can create our own kind of number.