how to bail if stdin is empty

[Jeff Epler]

You can test whether stdin is a "terminal", and act accordingly.

$ ./tt.py 
Standard input is a terminal.  Aborting!
$ ./tt.py < /dev/null
Standard input is a file.  Doing something.

#!/usr/bin/env python

import os
if os.isatty(0):
    print "Standard input is a terminal.  Aborting!"
else:
    print "Standard input is a file.  Doing something."
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