"Joel Koltner" <[EMAIL PROTECTED]> writes: > I have a generic (do nothing) exception class that's coded like this: > > class MyError(exceptions.Exception): > def __init__(self,args=None): > self.args = args > > When I attempt to raise this exception via 'raise MyError' I get an > exception within the MyError constructor __init__ as follows: > > Traceback (most recent call last): > [lines deleted] > File "c:\Documents and Settings\Joel.Kolstad\My Documents\Python\ > MyStuff.py", line 7, in __init__ > self.args = args > TypeError: 'NoneType' object is not iterable
That's because the class 'Exception' defines a descriptor 'args' which has to be a sequence. Just call 'args' something else, and it will work. E.g. >>> class MyError(Exception): ... def __init__(self, args=None): ... self.myargs = args ... >>> MyError() MyError() OTOH you could just take advantage of Exception.args: >>> class MyError(Exception): pass ... >>> MyError() MyError() >>> MyError(1, 2, 3) MyError(1, 2, 3) (Details in the documentation are a bit scant, but see http://docs.python.org/lib/module-exceptions.html) HTH -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
