old_contents: from flask import Flask
  
  app = Flask(__name__)
  app.config.from_object('sherry.default_settings')
  
  import sherry.views
  
new_contents: import jinja2
  from flask import Flask
  from sherry import converters
  
  app = Flask(__name__)
  app.config.from_object('sherry.default_settings')
  app.url_map.converters['mac'] = converters.MacConverter
  app.jinja_env.undefined = jinja2.StrictUndefined
  
  import sherry.views
  
subject: Use strict template rendering.