how can i register the non-default browser with the webbrowser module?

[Levi Nie]

how can i register the non-default browser with the webbrowser module?

the case:
i want open a site such as "google.com" in ie8 with the python.But my
default is chrome.
so i want to register a ie8 controller with the webbrowser.register(*name*,
*constructor*[, *instance*]).
so what does the parameter "constructor" "instance" mean?
how can i do it?
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