class Book(object): """A Book Object.""" def __init__(self, title, author, pub_yr='Unknown'): self.title = title self.author = author self.pub_yr = pub_yr

def __repr__(self): return '' % (self.title)

class Library(object): """A collection of book objects."""

def __init__(self): self.books = []

def __repr__(self): return '' % (len(self.books))

def list_books(self): """List all the books in the library."""

if len(self.books) == 0: print "Library is empty." return for book in self.books: print book.title print ' Author:', book.author print ' Published:', book.pub_yr print

def add_book(self, book): """Add a book to the library."""

if not isinstance(book, Book): raise Exception('Please enter a Book Object to add to the library') self.books.append(book) print 'Added: %s' % (book.title)

def empty_library(self): """Remove all books from the library.""" pass

########### WRITE YOUR SCRIPT HERE # Details on what the script should include are in the skills assessment # instructions. b1 =Book("The Bell Jar", "Sylvia Plath", 1963)

#printing book1 information

print " Book b1 : ",b1 print 'Book b1 Publication year : ',b1.pub_yr

b2 =Book("Anna Karenina", "Leo Tolstoy")

#printing b2 information

print' ' print "Book b2 : ",b2 print 'Book b2 Publication year : ',b2.pub_yr

#Instantiate a library object l = Library() print(l)

# Adding books to Library l.add_book(b1); l.add_book(b2); print " " # Listing books l.list_books();

Question:

Finish the empty_library method in the Library class. It should remove all the books from a library.

Call the empty_library method at the bottom of the script you wrote in Part One. Then, call the method that lists the books in a library and verify that it shows that the library is now empty.