How does python import order affect names? -

i'm doing flask tutorial (http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world) , came upon behaviour couldn't explain. main directory structure of tutorial :

microblog | |---- app  |     |---- __init__.py |     |---- views.py   | |---- flask   |---- run.py 

and contents of files :

microblog/run.py

#!flask/bin/python  app import app app.run(debug=true) 

microblog/app/init.py

from flask import flask app = flask(__name__) app import views  

microblog/app/views.py

from app import app  @app.route("/") @app.route("/index")  def index():     return "hello world!" 

everything works if transpose these 2 lines:

app = flask(__name__) app import views 

in views.py , execute run.py get:

importerror: cannot import name app

why happen?

because you're trying import newly created variable app. if want import variable modules, use importlib package:

my_module = importlib.import_module(app, 'view')