Which exception to use?
BPettersen at NAREX.com
Tue Jan 28 20:42:18 CET 2003
> From: Edward C. Jones [mailto:edcjones at erols.com]
> Which exception is it best to use in the following pieces of code?
> if len(sys.argv) != 2:
> raise SomeException, 'program requires exactly one argument'
Do you really want a traceback in this case?...
print >> sys.stderr, 'program requires exactly one argument'
> if len(sometuple) != 3:
> raise SomeException, 'sometuple must have length 3'
> I use TypeError or ValueError but they don't feel right. I wish there
> was a SizeError or LengthError.
It would generally be a value error, however if you think a SizeError is
better, nothing is stopping you:
class SizeError(ValueError): pass
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