- The browser class mechanize.Browser implements the interface of urllib2.OpenerDirector, so any URL can be opened, not just http.
- Easy HTML form filling.
- Convenient link parsing and following.
- Browser history (.back() and .reload() methods).
- The Referer HTTP header is added properly (optional).
- Automatic observance of robots.txt.
- Automatic handling of HTTP-Equiv and Refresh.