old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from __future__ import print_function
  from future.standard_library import install_aliases
  install_aliases()
  
  from urllib.parse import urlparse, urlencode
  from urllib.request import urlopen, Request
  from urllib.error import HTTPError
  
  import json
  import os
  
  from flask import Flask
  from flask import request
  from flask import make_response
  
  # Flask app should start in global layout
  app = Flask(__name__)
  
  
  @app.route('/', methods=['POST'])
  def processing():
      return '13507e18'
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from __future__ import print_function
  from future.standard_library import install_aliases
  install_aliases()
  
  from urllib.parse import urlparse, urlencode
  from urllib.request import urlopen, Request
  from urllib.error import HTTPError
  
  import json
  import os
  
  from flask import Flask
  from flask import request
  from flask import make_response
  
  # Flask app should start in global layout
  app = Flask(__name__)
  
  @app.route('/')
  def hello_world():
      return 'Hello from Flask!'
  
subject: Create app.py