Here is how to open the user’s default browser with a given url:
import webbrowser
url = "https://www.google.com/"
webbrowser.open(url, new=0, autoraise=True)
Here is the documentation about this functionality. It’s part of Python’s stdlibs:
http://docs.python.org/library/webbrowser.html
I have tested this successfully on Linux, Ubuntu 10.10.