Python Flask cannot set debug mode to true

Question

I have set up my first Flask project with PyCharm and this is my app.py file:

from flask import Flask

app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'TEST'


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

I want to run my project in debug mode so that I do not have to restart the server every time something changes. I provide the app.run function with a debug=True parameter, but this does not seem to change the debug flag. The application does start however and I do see "TEST" on the page, but this is with the debug flag set to False.

I also tried to directly change my env variable with os.environ["FLASK_DEBUG"] = "True", but this did not affect the flag also.

Any advice?

this does not seem to work Please explain what you tried that didn't work — Sociopath
– Sociopath, Commented Feb 18, 2020 at 8:06
This debug=True has nothing to do with that.It just enables Werkzeug debugger — Chathuranga
– Chathuranga, Commented Feb 18, 2020 at 8:08
Are you running it using the flask command, with FLASK_ENV=development? See flask.palletsprojects.com/en/1.1.x/server/#server. — nneonneo
– nneonneo, Commented Feb 18, 2020 at 8:08
Run your flask app in command line instead of PyCharm. python3 app.py — Johnson Zhou
– Johnson Zhou, Commented Feb 18, 2020 at 8:11

Iron · Accepted Answer · 2020-02-18 08:24:08Z

1

If you're using PyCharm, in Run/Debug config you can pass FLASK_DEBUG variable. Try to set it to "1", not to "True".

answered Feb 18, 2020 at 8:24

Iron

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Johnson Zhou · Accepted Answer · 2020-02-18 08:42:20Z

1

Run your flask app in command line instead of PyCharm. python3 app.py

answered Feb 18, 2020 at 8:42

Johnson Zhou

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