It would be good to have a clear exposition of the pros and cons of __new__ usage.
It is there mostly because __init__ would not work on immutable types.
OTOH, you probably do not want to use __new__ on mutable types
(once I was caught by this trap, google for "overriding list.__new__"
if you are interested).
Michele Simionato
Thanks. The use of __new__ for immutable classes is described in:
http://www.python.org/2.2.3/descrintro.htmlThis distinction hadn't registered with me before.
The Martelli bible doesn't bring this out.
It seems to me that __new__ should probably be deprecated for mutable classes.
Colin W. -- http://mail.python.org/mailman/listinfo/python-list
