Debugging a Flask application can be done in a few different ways.
1. Using the Flask Debugger: The Flask Debugger allows you to debug your application in a browser window. To use it, you need to set the debug flag to True in the application configuration. Once the flag is set, the Flask Debugger will be enabled when you run the application. You can then use the debugger to view and debug the application code.
For example:
app = Flask(__name__)
app.config[‘DEBUG’] = True
@app.route(‘/’)
def hello_world():
return ‘Hello World!’
if __name__ == ‘__main__’:
app.run()
2. Using a Debugger Tool: There are several debugger tools available for debugging Flask applications. These tools allow you to step through the code line by line and examine variables and objects. Popular debugger tools include pdb and ipdb.
For example:
import pdb
@app.route(‘/’)
def hello_world():
pdb.set_trace()
return ‘Hello World!’
if __name__ == ‘__main__’:
app.run()
3. Using Logging: Logging is another way to debug a Flask application. You can use the logging module to log messages to a log file. This can be useful for tracking down errors and debugging problems.
For example:
import logging
app = Flask(__name__)
@app.route(‘/’)
def hello_world():
logging.info(‘Hello World!’)
return ‘Hello World!’
if __name__ == ‘__main__’:
app.run()