Flask Debug Toolbar

Flask Debug Toolbar is a Flask extension that aids development by adding debugging tools into the web view of your application. It gives you information such as the bottlenecks in your view rendering code, and how many SQLAlchemy queries it took to render the view.

As always, we will use pip to install Flask Debug Toolbar:

$ pip install flask-debugtoolbar

Next, we need to add Flask Debug Toolbar to the extensions.py file. As we will be modifying this file a lot in this chapter, here is the start of the file so far along with the code to initialize Flask Debug Toolbar:

from flask import flash, redirect, url_for, session
from flask.ext.bcrypt import Bcrypt
from flask.ext.openid import OpenID
from flask_oauth import OAuth
from flask.ext.login import LoginManager
from flask.ext.principal import Principal, Permission, RoleNeed
from flask.ext.restful import Api
from flask.ext.celery import Celery
from flask.ext.debugtoolbar import DebugToolbarExtension

bcrypt = Bcrypt()
oid...