加载并保持变量/对象在python Flask服务器中的文件之间可访问

Question

When I start my flask app, I want it to immediately load an object, and I want this object to be available to functions defined in other files.

The way things are set up now is as follows:

object = someObjectToLoadAtServerStartAndAlwaysKeepInMemoryAndAccessFromAnyPyFile

In run.py, located in folder Project:

from app import app
app.run(debug = True)

In __init__.py, located in Project/app:

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

In views.py, located in Project/app:

from app import app
@app.route('/page')
def func():
  #access preloaded variable here#

Note that I want the object (which is saved to a file) to be loaded immediately after the app is started, and maintained forever as long as the app is running. I have tried any number of things, defining the object everywhere I can, and using global, but it is never accessible to func()

If I define it on top of views.py, will it load even no one has used one of the @app.routes?

Answer 1

All right, after I change __init.py__ to __init__.py , this will work:

File tree :

Project
├── app
│   ├── __init__.py
│   └── views.py
└── run.py

run.py :

from app import app
app.run(debug = True)

app/__init__.py :

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

app/views.py :

from app import app
@app.route('/page')
def func():
    return 'Hello'

Here is a demo:

Answer 2

If you have a look at how the LoginManager manager instance 'lm' is handled in part 6 of the Flask Mega-Tutorial, that gives you a great example to work from.

Any object declared in the init .py for the app module is then accessed by a direct import in the relevant file (eg. 'from app import lm')

See if this makes things clearer: http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-v-user-logins