Write a class definition named Book. The Book class should have data attributes for a book’s title, the author’s name, and the publisher’s name. The class should also have the following:

a. An _ _init_ _ method for the class. The method should accept an argument for each of the data attributes.

b. Accessor and mutator methods for each data attribute.

c. An _ _str_ _ method that returns a string indicating the state of the object.