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Thanks for sys.executable and 'nul' hints!

I only want to add two notes:

1) isrealfile(file('nul')) -> True

So 'nul' has a 'real' implementation

2) sys.executables isn't very useful for me, since I can do:
    pythonw ascript.py > afile

In this case sys.stdout is a 'real file', so I don't want to
redirect it to a null device.


In all cases, isrealfile work as I want.