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I agree that this patch will improve chances that
webbrowser.open() will succeed. I'm a bit worried though
that if a user sets BROWSER incorrectly, it may cause some
confusion to see another browser opening. So we might some
some bug reports saying "webbrowser.py ignores BROWSER
variable" because a user set BROWSER incorrectly. One
solution might be to print some warning message if the
browser specified in BROWSER cannot be used.
(I'm just a patch reviewer, not an official Python
developer, so you don't need to take my comment to seriously
:-)).