Question about raise and exceptions.

[Bruno Desthuilliers]

Daniel Klein a écrit :
> 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 !-)