Split Python Flask app into multiple files

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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 Flask
from AccountAPI import account_api

app = Flask(__name__)

app.register_blueprint(account_api)

@app.route("https://stackoverflow.com/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

AccountAPI.py

from flask import Blueprint

account_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.

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