How to tell if I'm being run from a shell or a module

[Sion Arrowsmith]

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
>a) See if the __main__ module has a __file__ attribute.
>b) See if sys.stdin is a real tty

c) See if sys.argv[0] != ''

(Although this works for the command line interactive shell, I've a
suspicion it will fail with IDLE. But I don't have IDLE to hand to
check.)

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