text: """Luokka kirjaoliolle
  """
  
  class Book:
      """Kirja
      """
      def __init__(self, name, author, isbn=None, description=None, read=False):
          """Kirjan konstruktori
          """
          self.name = name
          self.author = author
          self.isbn = isbn or None
          self.description = description or None
  
          self.read = read
          self.type = 1
  
      def __str__(self):
          string = f"\nName: {self.name}\n" \
                  f"Author: {self.author}\n" \
                  f"ISBN: {self.isbn if self.isbn is not None else 'Unknown'}\n" \
                  f"Description: {self.description if self.description is not None else 'None'}\n"
                  #f"Read: {'Yes' if self.read else 'No'}\n"
          return string
  