Flask: circular import problem

_error_

Traceback (most recent call last):
  File "server.py", line 8, in <module>
    from models import User
  File "/home/max/Projekte/flask-testing-stuff/models.py", line 1, in <module>
    from server import db
  File "/home/max/Projekte/flask-testing-stuff/server.py", line 8, in <module>
    from models import User
ImportError: cannot import name User

models.py

from server import db

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)

server.py

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
db = SQLAlchemy(app)

from models import User

#class User(db.Model):
#    id = db.Column(db.Integer, primary_key=True)
#    username = db.Column(db.String(80), unique=True)

@app.route('/<name>')
def index(name):
    user = User()
    user.username = name
    db.session.add(user)
    db.session.commit()
    return str(User.query.all())

if __name__ == '__main__':
    from os.path import isfile
    if not isfile('/tmp/test.db'):
        db.create_all()
    app.run(debug=True)

solution_could_be

14:35:00 < mitsuhiko> dAnjou: setup i would recommend:
14:35:09 < mitsuhiko> __init__.py makes the flask extension instances
14:35:14 < mitsuhiko> views.py has the view functions in a blueprint
14:35:23 < mitsuhiko> models.py has your models
14:35:35 < mitsuhiko> app.py has a function that imports everything and makes an instance of the app in a function
14:35:57 < mitsuhiko> nothing depends on app.py but views can import models just fine
14:36:01 < mitsuhiko> and all of them can import from __init__.py
14:36:08 < mitsuhiko> because it has no dependency on anything else

It's ugly in solution_could_be file.