text: """
  what flask do when 404 or something wrong happens
  """
  from flask import render_template
  from . import main
  
  
  @main.app_errorhandler(404)
  def page_not_found(e):
      """
      404 error page
      """
      return render_template('404.html'), 404
  
  
  @main.app_errorhandler(500)
  def internal_server_error(e):
      """
      500 error page
      """
      return render_template('500.html'), 500
  
  