spir wrote:
Hello,
I have (again) some issue using __new__.
What I need is basically to catch an object creation and yield an object of an
alternate type, when a condition is met.
Basically, the outline looks like:
class Normal(object):
def __new__(cls, arg):
if cond(arg):
# <yield instance of Special>
# expression is simply: Special(arg)
# must be __init__ialised !
# Conceptually, nothing to change:
# <yield instance of Normal>
# must be __init__ialised !
But I got issues in both cases:
* cannot find how to get Special objects initialised
* cannot find how to return Normal object
(also Normal's supertype has no explicite __new__, but it has an __init__)
Maybe it's just me, but why don't you use a factory function?
def make(args):
if cond(args):
return Special(args)
else:
return Normal(args)
Albert
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