On Tue, 15 Feb 2011 19:23:39 -0700, spam wrote:
> How can I do something like this in python:
>
> #!/usr/bin/python3.1
>
> class MyNumbers:
> def __init__(self, n):
> self.original_value = n
> if n <= 100:
> self = SmallNumers(self)
> else:
> self = BigNumbers(self)
(1) self is just a local variable, it isn't privileged in any way.
Assigning to the name "self" doesn't magically change the instance, so
that can't work.
(2) By the time the __init__ method is called, the instance has been
created. __init__ is the initializer, you need the constructor. Something
like this:
# Untested.
class MyNumbers:
def __new__(cls, n):
if n <= 100:
instance = SmallNumbers(n)
else:
instance = BigNumbers(n)
return instance
--
Steven
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