I want to build a python script to submit some form on internet website. Such as a form to publish automaticaly some item on site like ebay. 

Is it possible to do it with BeautifulSoup or this is only to parse some website? 
Is it possible to do it with selenium but quickly without open really the browser?
Are there any other ways to do it?
You can use selenium with PhantomJS to do this without the browser opening. You have to use the Keys portion of selenium to send data to the form to be submitted.  It is also worth noting that this method will not work if there are captcha's on the form.
Submit form on internet website