[issue3177] Add shutil.open

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

> As an example, ``os.startfile("a.py")`` will usually run `a.py`
> in the Python interpreter, while ``xdg-open a.py`` it will
> usually open the source code in an editor on Linux.

Well, so how about on UNIX shutil.launch (or whatever it's called) first checks to see if we're referring to a file.  If we are, check to see if it's marked executable.  If it is, execute it under a shell.  Failing *that* we could run xdg-open where available.

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nosy: +larry

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