Python flask_debugtoolbar 模块，DebugToolbarExtension() 实例源码

def create_app(config_name=None):
    if not config_name:
        config_name = os.environ.get('FLASK_CONFIG', 'development')

    app = Flask(__name__, instance_relative_config=True)

    app.config.from_object(config[config_name])
    app.config.from_pyfile('config.py')

    app.jinja_env.trim_blocks = True
    app.jinja_env.lstrip_blocks = True

    from .main import main
    app.register_blueprint(main)

    csrf.init_app(app)
    db.init_app(app)
    tweepy.init_app(app)

    toolbar = DebugToolbarExtension(app)

    return app

def debug_app(app):
    """Add the debug toolbar extension to the application."""
    app.jinja_env.undefined = jinja2.StrictUndefined

    try:
        import flask_debugtoolbar
    except ImportError:
        flask_debugtoolbar = None
    else:
        app.config['SECRET_KEY'] = 'debug-secret-key'
        flask_debugtoolbar.DebugToolbarExtension(app)

def register_debug(app):
    toolbar = DebugToolbarExtension()  # Setting up the debug toolbar step1
    toolbar.init_app(app)  # Setting up the debug toolbar step2