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

Given this python code:

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

I would ex开发者_开发知识库pect a browser to open up, load the first website, then load the second website in the same window. However, it opens up in a new window (or new tab depending on which browser I'm using).

Tried on Mac OSX with Safari, Firefox and Chrome and on Ubuntue with Firefox. I'm inclined to believe that new=0 isn't honored. Am I just missing something?

tia,

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Note that the documentation specifically avoids guarantees with the language if possible: http://docs.python.org/library/webbrowser.html#webbrowser.open

Most browser settings by default specify tab behavior and will not allow Python to override it. I have seen it in the past using Firefox and tried your example on Chrome to the same effect.

On Windows, it is not possible to specify the tab behavior at all, as suggested by my comment below. The url opening code ignores new:

if sys.platform[:3] == "win":
    class WindowsDefault(BaseBrowser):
        def open(self, url, new=0, autoraise=True):
            try:
                os.startfile(url)

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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)