[Tutor] checking if data files are good, readable, and exist

[Bryan Fodness]

I would like to check to see if the data files are good, readable, and
exist.  I have checked to see if they exist, but their is a possibility that
the data file might be binary, and I would like to have a sys.exit for that
as well.

if not os.path.isfile(A_data) or not os.path.isfile(B_data)\
   or not os.path.isfile(C_data) or not os.path.isfile(D_data):
    sys.exit(14)




-- 
"The game of science can accurately be described as a never-ending insult to
human intelligence." - João Magueijo
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