best python lib to make the textarea safe in the web page when user submit
You can try Web2py , it is a webframework for python with support for Wiki Markup , MarkDown , and many things + Server side Validation , XSS Prevention. If you want to use only it's Lib you can use gluon of web2py (which is lib of web2py framework)
www.web2py.com
i want to clean some tag like : <script> and other,
so what python lib you are  using to do this .
thanks