def exact_match(book):
search = Book.get_or_none((Book.title == book.title)
& (Book.author == book.author))
return search is not None
def get_book_by_id(book_id):
""" Searches list for Book with given ID,
:param id the ID to search for
:returns the book, if found, or None if book not found.
"""
return Book.get_or_none(Book.id == book_id)