如何在Brython中使用ajax

I am writing a web application using Flask and would like to use browser.ajax functionality in Brython but couldn't find a workable example. It would be very nice if someone demonstrates a short example how to use ajax in Brython. More specifically, how to pass data entered by a user into a textfield to a textarea by clicking submit button. Any help is highly appreciated! I am writing a web application using Flask and