running a flask app .py with python instead of "flask run"

Question

i am trying to run my app.py which is in flask with "python app.py" instead of "flask run". i have the following in the app.py. but when i run it via python, the html pages dont show up and says requested url not found. i am not sure what i am missing here. keep in mind the app runs fine when i use flask run command. the webpage shows on the browser fine. but when i use the "python app.py" the browser says the url is not found. i am not sure if i need to redirect something or not



app = Flask(__name__) 
if __name__ == "__main__":    
 app.run(host="10.147.180.15", port="80", debug=True)

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

any help will be greatly appreciate it

Your example (mostly) works for me (app needs to be defined before the decorator for app, but I assume you have that part working). Where are you seeing the error message, in the browser or in the logs from your application? — Karl
– Karl, Commented Sep 2, 2020 at 20:06
This question would benefit from a Minimal, Reproducible Example. — noslenkwah
– noslenkwah, Commented Sep 2, 2020 at 20:33

Jürgen Gmach · Accepted Answer · 2020-09-03 07:24:03Z

2

You should declare app before initiating routes:

app = Flask(__name__)
@app.route('/')
def index():
    return render_template("index.html")

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

Edited: fixed indentation

edited Sep 3, 2020 at 7:24

Jürgen Gmach

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answered Sep 2, 2020 at 20:26

Seyi Daniel

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3 Comments

Ahmad_R Over a year ago

i apologize i have copy/paste it wrong, i have edited the post with the correct code

Ahmad_R Over a year ago

yes it works :) thanks so much now i can deploy my iis ;) can you please explain what is the difference if the "if statemenet be at the top or at the end of the code?

Seyi Daniel Over a year ago

Either way, it shouldn't cause any problem, i was responding to your initial post (before the update). There, you had app = Flask(__name__) after app.run and that's more like referencing a variable before its declaration.

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