Add profiling to Python Flask app

manage.py

@manager.command
def profile(length=500, profile_dir=None):
    """Start the application under the code profiler."""
    from werkzeug.contrib.profiler import ProfilerMiddleware
    application.wsgi_app = ProfilerMiddleware(application.wsgi_app, restrictions=[length], profile_dir=profile_dir,
                                              sort_by=('time', 'calls'))
    application.run()