What are some potential efficiency disadvantages of having very shallow inheritance trees, that is, a large set of classes, A, B, C, and so on, such that all of these classes extend a single class, Z?...

What are some potential efficiency disadvantages of having very shallow inheritance trees, that is, a large set of classes, A, B, C, and so on, such that all of these classes extend a single class, Z?

The collections.Sequence abstract base class does not provide support for comparing two sequences to each other. Modify our Sequence class from Code Fragment 2.14 to include a definition for the _ _eq_ _ method, so that expression seq1 == seq2 will return True precisely when the two sequences are element by element equivalent.