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On the newly-released macOS Sierra 10.12.5, the default web browser which is meant to returned by webbrowser.get() gives an error. Specifically:
 >>> import webbrowser
 >>> br = webbrowser.get()
 >>> br.open("http://python.org")
 0:33: execution error: "http://python.org" doesn’t understand the "open location" message. (-1708)
 False
 >>> ### but this works
 >>> br = webbrowser.get("safari")
 >>> br.open("http://python.org")
True