web app development using flask and python

Question

I am developing a login form using flask version 1.0.2 in python 3.6 and HTML in Pycharm IDE but the problem is when i edit python code in app.py file i expect the changes to take effect and when i run on default url, http://127.0.0.1:5000/, it does not show the changes in the browser.The old first output keeps being printed.

I have deleted cache and cookies and browser history from all browsers plus using CNTRL + F5 for hard refresh but the problem has persisted.

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'men what are you doing !'

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

What could be the problem?**

Please, could you add some code so we can reproduce this problem ? — PRMoureu
– PRMoureu, Commented Jul 7, 2018 at 7:51
Are you restarting the server? If not then you may not have debug mode enabled which makes the server auto restart on change. If you restart the server does it show your changes? — Tim Thompson
– Tim Thompson, Commented Jul 7, 2018 at 10:46
the original code looks like this from flask import Flask app = Flask(name) @app.route('/') def hello_world(): return 'men what are you doing !' if name == 'main': app.run() but i edited this line of code to app.run(port=8080) and the browser updates — uncle mich
– uncle mich, Commented Jul 9, 2018 at 0:59

Grey Li · Accepted Answer · 2018-07-08 05:22:50Z

2

You will need to set enviroment variable FLASK_ENV to development (default to production) to enable debug mode:

$ export FLASK_ENV=development  # use > set ... on Windows

In debug mode, the reloader was enabled to detect file changes and reload the server.

answered Jul 8, 2018 at 5:22

Grey Li

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2 Comments

bluesmonk Over a year ago

also it is possible to do app.debug=True, or pass it as a parameter in app.run(debug=True)

Grey Li Over a year ago

You are right, but it is not recommended to directly set the app.debug and FLASK_DEBUG since Flask 1.0. Besides, the app.run() was not recommended too since Flask 0.11, see the changlog for more information.

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