Steven D'Aprano <[EMAIL PROTECTED]> writes: > I can construct an empty instance in the __new__ constructor, and I > can initialize an non-empty instance in the __init__ initializer, > but I can't think of any good way to stop __init__ from being called > if the instance is empty. In pseudo-code, I want to do something > like this: > > class Parrot(object): > def __new__(cls, data): > construct a new empty instance > if data is None: > return that empty instance > else: > call __init__ on the instance to populate it > return the non-empty instance
Suggestion 1: since you "construct a new empty instance" in both cases, simply move the entire logic to __init__. Suggestion 2: name your initialization method something other than __init__ and the calling-type-object-automatically-calls-__init__-after-__new__ simply disappears. Can you specify the way you'd like to instantiate the class? -- http://mail.python.org/mailman/listinfo/python-list
