Question débutante Python - Essayer de comprendre la déclaration de retour

def register():
    form = SignupForm(request.form)
    if request.method == 'POST' and form.validate():
        create_user = ({'username' : form.username.data, 'email' : form.email.data,
                            'password': form.password.data})
        flash('Thanks for registering')
        return create_user, redirect(url_for('loggedin.html'))
    return render_template('get-started.html', form=form)
SAMER SAEID