new_contents: # -*- coding: utf-8 -*-
  
  from flask import Blueprint, redirect, request
  
  from ImageForm import ImageForm
  from Image import Image, FlaskImage, FlaskModelImage
  
  
  def load_img(image_id):
      ImageForm(image_id).validate()
      return redirect(request.args.get('next', '/'))
  
  
  class ImageManager(object):
  
      def __init__(self, app=None, **kwargs):
          if app:
              self.init_app(app)
  
      def init_app(self, app):
  
          if 'IMAGE_EXTENSION' not in app.config:
              raise Exception(
                  'IMAGE_EXTENSION must be set in application configuration')
  
          if 'BASEDIR' not in app.config:
              raise Exception(
                  'BASEDIR must be set in application configuration')
  
          if 'IMAGE_SIZES' not in app.config:
              app.config['IMAGE_SIZES'] = {
                  'lg': 800,
                  'md': 500,
                  'sm': 300,
              }
          if 'ALLOWED_EXTENSIONS' in app.config:
              app.config['ALLOWED_EXTENSIONS'] = map(
                  str.lower, app.config['ALLOWED_EXTENSIONS'])
  
          module = Blueprint("imagemanager", __name__)
          module.add_url_rule('/load_image/<image_id>',
                              'load_image', load_img, methods=['POST'])
          app.register_blueprint(module, url_prefix=app.config.get(
              'IMAGE_URL') or '/imagemanager')
  
subject: Create __init__.py