old_contents: import os
  import webapp2
  import jinja2
  
  from google.appengine.ext import db
  
  template_dir = os.path.join(os.path.dirname(__file__), 'templates')
  jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),
                                 autoescape = True)
  
  def render_str(template, **params):
      t = jinja_env.get_template(template)
      return t.render(params)
  
  class BaseHandler(webapp2.RequestHandler):
      def render(self, template, **kw):
          self.response.out.write(render_str(template, **kw))
  
      def write(self, *a, **kw):
          self.response.out.write(*a, **kw)
  
  
  #this is how to make comments in python
  
  class Welcome(BaseHandler):
      def get(self):
          self.render('welcome.html')
  
  class About(BaseHandler):
      def get(self):
          self.render('about.html')
  
  
  
  app = webapp2.WSGIApplication([('/', Welcome)],[('/about', About)],
                                debug=True)
  
new_contents: import os
  import webapp2
  import jinja2
  
  from google.appengine.ext import db
  
  template_dir = os.path.join(os.path.dirname(__file__), 'templates')
  jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),
                                 autoescape = True)
  
  def render_str(template, **params):
      t = jinja_env.get_template(template)
      return t.render(params)
  
  class BaseHandler(webapp2.RequestHandler):
      def render(self, template, **kw):
          self.response.out.write(render_str(template, **kw))
  
      def write(self, *a, **kw):
          self.response.out.write(*a, **kw)
  
  
  #this is how to make comments in python
  
  class Welcome(BaseHandler):
      def get(self):
          self.render('welcome.html')
  
  class About(BaseHandler):
      def get(self):
          self.render('about.html')
  
  
  
  app = webapp2.WSGIApplication([('/', Welcome),('/about', About)],
                                debug=True)
  
subject: Update main.py