problem with change to exceptions

[Neal Becker]

import exceptions

class nothing (exceptions.Exception):
def __init__ (self, args=None):
self.args = args

if __name__ == "__main__":
raise nothing

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/tmp/python-3143hDH", line 5, in __init__
self.args = args
TypeError: 'NoneType' object is not iterable

I'll have to say, I don't understand this error.

 

[Paul Rubin]

TypeError: 'NoneType' object is not iterable
I'll have to say, I don't understand this error.

It's "lame duck typing". The .args attribute on an Exception instance
is expected to be a tuple of the arguments passed through the raise
statement. It is None if no args were passed.