How to debug a Flask app
How are you meant to debug errors in Flask? Print to the console? Flash messages to the page? Or is there a more powerful option available to figure out what\'s happening
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Quick tip - if you use a PyCharm, go to
Edit Configurations=>Configurationsand enableFLASK_DEBUGcheckbox, restart theRun.讨论(0) -
If you are running it locally and want to be able to step through the code:
python -m pdb script.py讨论(0) -
One can also use the Flask Debug Toolbar extension to get more detailed information embedded in rendered pages.
from flask import Flask from flask_debugtoolbar import DebugToolbarExtension import logging app = Flask(__name__) app.debug = True app.secret_key = 'development key' toolbar = DebugToolbarExtension(app) @app.route('/') def index(): logging.warning("See this message in Flask Debug Toolbar!") return "<html><body></body></html>"Start the application as follows:
FLASK_APP=main.py FLASK_DEBUG=1 flask run讨论(0) -
From the 1.1.x documentation, you can enable debug mode by exporting an environment variable to your shell prompt:
export FLASK_APP=/daemon/api/views.py # path to app export FLASK_DEBUG=1 python -m flask run --host=0.0.0.0讨论(0) -
If you want to debug your flask app then just go to the folder where flask app is. Don't forget to activate your virtual environment and paste the lines in the console change "mainfilename" to flask main file.
export FLASK_APP="mainfilename.py" export FLASK_DEBUG=1 python -m flask run --host=0.0.0.0After you enable your debugger for flask app almost every error will be printed on the console or on the browser window. If you want to figure out what's happening, you can use simple print statements or you can also use console.log() for javascript code.
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If you're using Visual Studio Code, replace
app.run(debug=True)with
app.run()It appears when turning on the internal debugger disables the VS Code debugger.
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