Author doughellmann
Recipients doughellmann
Date 2010-08-04.13:08:05
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Most of the argparse type converters handle exceptions with a single line error message explaining the problem.  For example, if an argument -i is declared as an int, but the value given ('a') cannot be converted to an int, the message is something like "argument -i: invalid int value: 'a'".  

On the other hand, FileType raises an IOError, which isn't being caught and converted to the simpler error message. Instead, a full traceback is printed.  To be consistent, the IOError should be trapped and a single error message printed.
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