opening a new tab in opera does not work

[solstice.dhiver]

hi.
i am using python 2.5.1
when i run
import webbrowser
webbrowser.get('opera').open_new_tab("http://www.osnews.com")
i got a True after the last command
but nothing happen at all in opera ! 

any one got that too ?

i use opera 9.20 
if i run in a command-line this
opera -remote 'openURL(http://osnews.com,new-page)'
it works

that's off-topic but when i run
webbrowser.get('konqueror').open_new_tab("http://www.osnews.com")
it open a new tab in opera (yes !) because i have defined my default
webbrowser in kde to be opera(precisely opera -newpage)