Chosing between sys.argv and sys.stdin

[Beat Bolli]

> How would I add something that says "use sys.stdin if they don't include
> commandline arguments, but if neither is present, print the error
> message"? Right now, if it calls sys.stdin.read() and it wasn't piped
> into (like calling "spam.py" rather than "cat file | spam.py") it just
> sits there until I hit ctrl-d.

Look at isatty(), a method of any file object. It returns 1 if the file is connected
to a tty(-like) device, otherwise 0.

Beat Bolli
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