One way to debug a Flask application is to use the built-in Python debugger, pdb. For example, if you have an application with a route like this:

@app.route(‘/’)
def index():
return ‘Hello World’

You can add the following code to the route to enable debugging:

import pdb

@app.route(‘/’)
def index():
pdb.set_trace()
return ‘Hello World’

Then, when you run the application, it will pause at the pdb.set_trace() line, allowing you to inspect variables, step through code, and so on.

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