在 PythonAnywhere 上部署的 Flask 应用程序上找不到 404

Question

I've rummaged through maybe 50 different answers to this and still I haven't manage to fix it... I'm pretty new to flask and python.

I have an app which was running great locally but I've struggled with deploying on python anywhere. Initially I had a few import modules issues, now it runs but doesn't return any html template, despite not seeing any other issue. The main issue I had was that it couldn't find the "routes" app from wsgi, and I sort of fixed adding the app = Flask( name ) line on routes.py (the short blueprint object is not callable).

routes.py:

from flask import Blueprint, render_template, request, redirect, send_file
import pyqrcode 
from pyqrcode import QRCode 
import subprocess

from extensions import db
from models import Link

app = Flask(__name__)

short = Blueprint('short', __name__, url_prefix='/')

@short.route('/index')
def index():
    return render_template('index.html')

init .py

from flask import Flask
from extensions import db
from routes import short

def create_app(config_file='settings.py'):

    app = Flask(__name__)

    app.config.from_pyfile(config_file)

    db.init_app(app)

    app.register_blueprint(short)

    return app

wsgi.py

import sys

# add your project directory to the sys.path
project_home = u'/home/b297py/mysite'

if project_home not in sys.path:
    sys.path = [project_home] + sys.path

# import flask app but need to call it "application" for WSGI to work
from routes import app as application

For the purpose of testing, I've placed all the html templates both in the root directory and in the specific /template directory but it just didn't fix the issue.

Answer 1

In wsgi.py you are not calling create_app so you are never registering the blueprint. You should replace:

from routes import app as application

by something like:

from package_name import create_app
application = create_app() 

(Example: https://www.pythonanywhere.com/forums/topic/12889/#id_post_50171 )

Also as you mentioned, the fix adding app = Flask(__name__) to routes.py allows you to bypass create_app (so you should remove it if you want to stick to the create_app approach).