Ken Starks wrote: > I have an exception class, and I want to check that > a particular instance of it has been raised; or > more accurately that one is raised that is equal to > an instance I specify. > > In the example below, I can check that a > 'LongRationalError' is raised, but I want > to check that it is specifically a > 'LongrationalError('1') or a 'LongRationalError('2') > > How do I do that?
(all untested) try: LongRational(1, "7") except LongRationalError, e: self.assertEquals(e.code, "2") else: self.fail() Alternatively you can subclass LongRationalError... class LongRationalError(Exception): pass class LongRationalDenominatorError(LongRationalError): pass class LongRationalNumeratorError(LongRationalError): pass ...and then check for the specialized exception: self.assertRaises(LongRationalDenominatorError, LongRational, 1, "7") Personally, I'd probably throw a plain old TypeError for incompatible types of both numerator and denominator. Peter -- http://mail.python.org/mailman/listinfo/python-list