如何在Brython中访问“this”对象？

Question

我在this旁边使用Brython库作为哈希路由器。我最初用纯JavaScript编写代码。路线的定义如下：

Router.add({
    path: '#/action/login',
    on: function() {
        /* I don't know how to port this call */
        populate_from_query(this.query);

        /* These calls can be ported: */
        Materialize.updateTextFields();
        do_login($('#email').val(), $('#password').val());
    }
});

在Brython，到目前为止，我有：

def route_on_action_login():
    # I can't write this as Python because I can't access the, "this object"
    #populate_from_query(this.query)

    window.Materialize.updateTextFields()
    do_login(document['email'].value, document['password'].value)

window.Router.add({
    'path': '#/action/login',
    'on': route_on_action_login
})

如何从作为Javascript回调传入的Brython函数中访问函数的“this”参数？