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Python Flask with SQLAlchemy Basics Creating a Basic Website with Flask Create a Flask App

Noor Hafiza Binti Ibrahim
Noor Hafiza Binti Ibrahim
11,712 Points
Posted by Noor Hafiza Binti Ibrahim
Noor Hafiza Binti Ibrahim
11,712 Points

Why? I can’t pass the challenge. I keep getting Bummer: You should have a dunder main at the end of your file.

A dunder main at the end of file?

app.py 
# insert your code here
from flask import Flask


app = Flask(__name__)

@app.route('/')
def index():
    return 'Hello Flask'

if __name__ == '__main__':
    app.run(host='0.0.0.0', port='8000')

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

Hey Noor Hafiza Binti Ibrahim, your code is functionally correct.

However, the very picky checker is looking for two blank lines between the function definition and the dunder name statement.

Post back if you need more help. Good luck!!!

Noor Hafiza Binti Ibrahim
Noor Hafiza Binti Ibrahim
11,712 Points
Noor Hafiza Binti Ibrahim
Noor Hafiza Binti Ibrahim
11,712 Points

Thank you for the tips 😊, Chris I’ve fixed the two blank lines between the function definition and the dunder name statement, but, the challenge still didn’t pass. Instead, i got a: Bummer: Make sure to place your route after your app variable. So, yup i’m still stuck 🥺

Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

For Task 3 the checker wants 2 blank lines above the function as well.

Drew Caruso
Drew Caruso
213 Points
Drew Caruso
Drew Caruso
213 Points

Is it just me or is this really bad design? if nothing is wrong with the code and it wants x lines after line of code, it should say, right?

Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

Perhaps. I believe the checker uses regex to check correctness. It would be quite a task to have a regex for every failing case. Sometimes the cases overlap and an error is caught be a more general regex. The first failing regex causes the failure so it might not have the specific info you’re looking for. In the “Test Results” panel, it shows which regex failed. This is how I debug failing student code.