Flask app.py stopped working in pycharm

Question

I am new to flask and pycharm. Basically I wrote a rest webservice and initially PyCharm was running it as a python script. Everything was working fine. But then after I realuched pycharm it detects app.py as a flask application.

Part that launches the app locally in app.py looks like so:

if __name__ == '__main__':
    from db import db

    db.init_app(app)

    if app.config['DEBUG']:
        @app.before_first_request
        def create_tables():
            db.create_all()

    app.run(port=5000)

The problem is that it seems like this part is not executed when I try to run app.py. I also have run.py which I use to run the app through uwsgi on a web server. Here is the console output from pycharm when I launch app.py :

FLASK_APP = app.py
FLASK_ENV = development
FLASK_DEBUG = 0
In folder /home/username/PycharmProjects/psychotest
/home/aydar/PycharmProjects/psychotest/venv/bin/python -m flask run
 * Serving Flask app "app.py"
 * Environment: development
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) 

I've added print statements to the if __name__=='main' block, which are never printed. It also seems that pycharm launches flask with /home/username/PycharmProjects/psychotest/venv/bin/python -m flask run . Also as you can see DEBUG is false, even though I explicitly set debug to true in the body of app.py like so:

app = Flask(__name__)
app.config['DEBUG'] = True

Everything is working through the terminal with just python app.py . How do I change this behaviour of Pycharm? It annoys me because I get sqlalchemy errors every time I try to get something from a database through flask. Error example:

    'The sqlalchemy extension was not registered to the current ' \
AssertionError: The sqlalchemy extension was not registered to the current application.  Please make sure to call init_app() first.

Answer 1

基于此答案，由于PyCharm将其检测为if __name__ == '__main__':应用程序，因此永远不会命中if __name__ == '__main__':块，因此您可能希望将db.init_app(app)移至该块之外（导入也是如此） ）

Answer 2

You can edit your configuration runned by Pycharm.

You can find it on the top right. There is a select box which your current configuration is selected.

Then don't use -m flask run as parameter but just app.py .

Answer 3

Actually I was able to solve the problem. While reformating app.py , namely moving db.init_app() outside of __name__=='__main__' , works - it was not ideal solution for me. Because I've already set up workflow, and I did not want to change execution logic of app.py just for PyCharm.

The solution was to disable flask integration in settings -> languages and frameworks. Everything works properly now.