old_contents: from flask import Flask
  from .mtr import MTR
  
  app = Flask(__name__)
  mtr = MTR()
  
  from app import views, mtrpy
  
  
new_contents: from flask import Flask
  from .mtrpy import MTR
  
  app = Flask(__name__)
  mtr = MTR()
  
  from app import views, mtrpy
  
  
subject: fix import issue