old_contents: """
  Definition of views.
  """
  
  from django.shortcuts import render
  from django.http import HttpRequest
  from django.template import RequestContext
  from datetime import datetime
  
  def home(request):
      """Renders the home page."""
      assert isinstance(request, HttpRequest)
      return render(
          request,
          'app/index.html',
          {
              'title':'Home Page',
              'year':datetime.now().year,
          }
      )
  
  def contact(request):
      """Renders the contact page."""
      assert isinstance(request, HttpRequest)
      return render(
          request,
          'app/contact.html',
          {
              'title':'Contact',
              'message':'Your contact page.',
              'year':datetime.now().year,
          }
      )
  
  def about(request):
      """Renders the about page."""
      assert isinstance(request, HttpRequest)
      return render(
          request,
          'app/about.html',
          {
              'title':'About1',
              'message':'Your application description page.',
              'year':datetime.now().year,
          }
      )
  
new_contents: """
  Definition of views.
  """
  
  from django.shortcuts import render
  from django.http import HttpRequest
  from datetime import datetime
  
  def home(request):
      """Renders the home page."""
      assert isinstance(request, HttpRequest)
      return render(
          request,
          'app/index.html',
          {
              'title':'Home Page',
              'year':datetime.now().year,
          }
      )
  
  def contact(request):
      """Renders the contact page."""
      assert isinstance(request, HttpRequest)
      return render(
          request,
          'app/contact.html',
          {
              'title':'Contact',
              'message':'Your contact page.',
              'year':datetime.now().year,
          }
      )
  
  def about(request):
      """Renders the about page."""
      assert isinstance(request, HttpRequest)
      return render(
          request,
          'app/about.html',
          {
              'title':'About1',
              'message':'Your application description page.',
              'year':datetime.now().year,
          }
      )
  
subject: remove unused imports