Question about raise and exceptions.

[Steven W. Orr]

On Wednesday, Feb 28th 2007 at 22:03 +0100, quoth Bruno Desthuilliers:

=>Daniel Klein a ?crit :
=>> On Wed, 28 Feb 2007 13:48:54 -0500 (EST), "Steven W. Orr"
=>> <steveo at syslang.net> wrote:
=>> 
=>> 
=>>>When I run it I get this:
=>>>
=>>>884 > ./t_fsm.py
=>>>Traceback (most recent call last):
=>>>  File "./t_fsm.py", line 3, in ?
=>>>    from fsm import *
=>>>  File "/home/boston/VIASAT/sorr/py/fsm/fsm.py", line 76
=>>>    raise TransitionError, self.curr_state, newstate, "Going to error 
=>>>state %d from state %d" % (self.curr_state, newstate)
=>>>                                                    ^
=>>>SyntaxError: invalid syntax
=>> 
=>> 
=>> The arguments for TransitionError must be a tuple, 
=>
=>Err...
=>
=>> eg:
=>> 
=>> msg = "Going to error state %d from state %d" % (self.curr_state,
=>> newstate)
=>> raise TransitionError(self, curr_state, newstate, msg)
=>
=>Where did you see a tuple here ? You're code is *calling* 
=>TransitionError, passing it the needed arguments.
=>
=>Note that it's the correct syntax - but not the correct explanation !-)

Ok. Now I'm potentially confused:
1. TransitionError takes 4 args
2. raise takes a tuple with four elements after the exception argument as 
its 2nd arg

I take it you mean #2?

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steveo at syslang.net