En Thu, 17 Apr 2008 19:11:36 -0300, Petr Jakeš <[EMAIL PROTECTED]> escribió:
> I am trying to dig through User-defined Exceptions. chapter 8.5 in > http://docs.python.org/tut/node10.html > > > I would like to know, if is it OK to add following line to the __init__ > method of the TransitionError class? > > self.args = (self.previous, self.next, self.message) Not necesarily, but you should call the base __init__, perhaps with a suitable message. Most of the time, a meaningful error message is all what I want, so I write: class FooError(Exception): pass (perhaps inheriting from ValueError or TypeError or any other more meaningful base error). Then, when something wrong is detected: if ....: raise FooError, "some %s message" % foo In your case, you appear to require more info stored in the exception. Try this (based on your code): class TransitionError(Error): # I assume Error inherits from Exception? def __init__(self, previous, next, message): self.previous = previous self.next = next Error.__init__(self, previous, next, message) # perhaps: Error.__init__(self, message) # if message already contain references to # previous and next raise TransitionError, (1, 2, "oops") Traceback (most recent call last): File "<stdin>", line 1, in <module> __main__.TransitionError: (1, 2, 'oops') -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
