Split Python Flask app into multiple files

Yes, Blueprints are the right way to do it. What you are trying to do can be achieved like this:

Main.py

from flask import Flaskfrom AccountAPI import account_apiapp = Flask(__name__)app.register_blueprint(account_api)@app.route("/")def hello():    return "Hello World!"if __name__ == "__main__":    app.run()

AccountAPI.py

from flask import Blueprintaccount_api = Blueprint('account_api', __name__)@account_api.route("/account")def accountList():    return "list of accounts"

If this is an option, you might consider using different URL prefixes for the different APIs/Blueprints in order to cleanly separate them. This can be done with a slight modification to the above register_blueprint call:

app.register_blueprint(account_api, url_prefix='/accounts')

For further documentation, you may also have a look at the official docs.

Using Blueprint you can add your routes in the routes directory.

Structure

app.pyroutes    __init__.py    index.py    users.py

__init__.py

from flask import Blueprintroutes = Blueprint('routes', __name__)from .index import *from .users import *

index.py

from flask import render_templatefrom . import routes@routes.route('/')def index():    return render_template('index.html')

users.py

from flask import render_templatefrom . import routes@routes.route('/users')def users():    return render_template('users.html')

app.py

from routes import *app.register_blueprint(routes)

If you want to add a new route file, say accounts.py, you just need to create the file accounts.py in the routes directory, just like index.py and users.py, then import it in the routes.__init__.py file

from .accounts import *

If you are using blueprints and want to route / redirect to a url of your blueprint inside a template you are using you need to use the correct url_for statement.

In your case if you would like to open the url account of your blueprint you have to state it like this in your template:

href="{{ url_for('account_api.account') }}"

and for the main app it would look like this:

redirect(url_for('account_api.account'))

Otherwise the werkzeug library will throw an error.