old_contents: from django.core.urlresolvers import reverse
  from django.http.response import HttpResponse, HttpResponseRedirect
  from django.shortcuts import render
  from django.utils.translation import ugettext as _
  
  from books.forms import BookForm
  from shared.models import BookType
  
  
  def index(request):
      book_list = BookType.objects.all()
      args = {'book_list': book_list}
      if request.session['success_msg']:
          args['success_msg'] = {
              'book_added': _("The book was added successfully!")
          }[request.session['success_msg']]
      return render(request, 'books/index.html', args)
  
  
  def add_book(request):
      if request.method == 'POST':
          form = BookForm(request.POST)
          if form.is_valid():
              book_type = BookType(publisher=form.cleaned_data['publisher'], title=form.cleaned_data['title'],
                                   issue=form.cleaned_data['issue'], issue_year=form.cleaned_data['issue_year'],
                                   price=form.cleaned_data['price'] * 100)
              book_type.save()
              request.session['success_msg'] = 'book_added'
              return HttpResponseRedirect(reverse('index'))
      else:
          form = BookForm()
          return render(request, 'books/add.html', {'form': form})
  
  
  def edit_book(request, book_id):
      return HttpResponse("Hello world!")
  
  
  def remove_book(request, book_id):
      return HttpResponse("Hello world!")
  
new_contents: from django.core.urlresolvers import reverse
  from django.http.response import HttpResponse, HttpResponseRedirect
  from django.shortcuts import render
  from django.utils.translation import ugettext as _
  
  from books.forms import BookForm
  from shared.models import BookType
  
  
  def index(request):
      book_list = BookType.objects.all()
      args = {'book_list': book_list}
      if 'success_msg' in request.session:
          args['success_msg'] = {
              'book_added': _("The book was added successfully!")
          }[request.session['success_msg']]
          del request.session['success_msg']
      return render(request, 'books/index.html', args)
  
  
  def add_book(request):
      if request.method == 'POST':
          form = BookForm(request.POST)
          if form.is_valid():
              book_type = BookType(publisher=form.cleaned_data['publisher'], title=form.cleaned_data['title'],
                                   issue=form.cleaned_data['issue'], issue_year=form.cleaned_data['issue_year'],
                                   price=form.cleaned_data['price'] * 100)
              book_type.save()
              request.session['success_msg'] = 'book_added'
              return HttpResponseRedirect(reverse('index'))
      else:
          form = BookForm()
          return render(request, 'books/add.html', {'form': form})
  
  
  def edit_book(request, book_id):
      return HttpResponse("Hello world!")
  
  
  def remove_book(request, book_id):
      return HttpResponse("Hello world!")
  
subject: Fix KeyError in alerts implementation