Why does my view function 404?

Question

Directory Structure:

__init__:

from flask import flask 

app = Flask(__name__)


if __name__ == '__main__'
    app.run()

Views:

from app import app

@app.route('/')
def hello_world():
    return 'Hello World!'

I hope someone can explain what I am doing wrong here - I guess I'm not understanding how to properly import app. This results in a 404. However when views is moved back to __init__ everything works properly.

Answer 1

You need to explicitly import your views module in your __init__:

from flask import flask 

app = Flask(__name__)
from . import views    

Without importing the module, the view registrations are never made.

Do keep the script portion outside of your package. Add a separate file in Final_app (so outside the app directory) that runs your development server; say run.py:

def main():
    from app import app
    app.run()

if __name__ == '__main__'
    main()