old_contents: # http://flask.pocoo.org/docs/1.0/tutorial/factory/
  
  import os
  
  from flask import Flask
  
  def create_app(test_config=None):
      # create and configure the app
      app = Flask(__name__, instance_relative_config=None)
      app.config.from_mapping(SECRET_KEY='dev',
                              DATABASE=os.path.join(app.instance_path,
                              'myflask.sqlite'))
      if test_config is None:
          # load the instance config, if it exists, when not testing
          app.config.from_pyfile('config.py', silent=True)
      else:
          # load the test config if passed in
          app.config.from_mapping
  
new_contents: # http://flask.pocoo.org/docs/1.0/tutorial/factory/
  
  import os
  
  from flask import Flask
  
  def create_app(test_config=None):
      # create and configure the app
      app = Flask(__name__, instance_relative_config=None)
      app.config.from_mapping(SECRET_KEY='dev',
                              DATABASE=os.path.join(app.instance_path,
                              'myflask.sqlite'))
      if test_config is None:
          # load the instance config, if it exists, when not testing
          app.config.from_pyfile('config.py', silent=True)
      else:
          # load the test config if passed in
          app.config.from_mapping
  
      # ensure the instance folder exists
      try:
          os.makedirs(app.instance_path)
      except OSError as ex:
          pass
  
      # a simple page that says hello
      @app.route('/hello')
      def hello():
          return 'Hello World!!!'
  
      return app
  
  
subject: update flask example