old_contents: from django.shortcuts import render
  from .models import BookInstance
  # Create your views here.
  
  def index(request):
      """
      View function for home page of site.
      """
      getBook1 = getBook("DJK831LOK")
      getBook2 = getBook("741KLO012")
  
      # Render the test HTML template index.html
      return render(
          request,
          'index.html',
          context={'getBook1':getBook1,'getBook2':getBook2,}
      )
  
  def getBook(code):
      try:
          book = BookInstance.objects.get(access_code=code).id
      except BookInstance.DoesNotExist:
              book = -1
      return book
new_contents: from django.shortcuts import render
  from .models import BookInstance
  # Create your views here.
  
  def index(request):
      """
      View function for home page of site.
      """
      getBook1 = getBook("DJK831LOK")
      getBook2 = getBook("741KLO012")
  
      # Render the test HTML template index.html
      return render(
          request,
          'index.html',
          context={'getBook1':getBook1,'getBook2':getBook2,}
      )
  
  def getBook(code):
      """
      Takes a secret BookInstance access code and converts it to the public BookInstance id.
      If the given code has no corresponding book, it returns 0.
      """
      try:
          book = BookInstance.objects.get(access_code=code).id
      except BookInstance.DoesNotExist:
          book = -1
      return book
  
  
subject: Add documentation to GetBook()