Python webbrowser.open() - setting new=0 to open in the same browser window doesn't work

Question

Given this python code:

import webbrowser
webbrowser.open(\"http://slashdot.org\",new=0)
webbrowser.open(\"http://cnn.com\",new=0)

I would

Answer 1

I added a delay between successive invocations of webbrowser.open(). Then each was opened in a new tab instead of a separate window (on my Windows 10 machine).

import time
...
time.sleep(0.5)