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Message from discussion OOP / language design question
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Duncan Booth  
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 More options Apr 25 2006, 9:25 am
Newsgroups: comp.lang.python
From: Duncan Booth <duncan.bo...@invalid.invalid>
Date: 25 Apr 2006 13:25:31 GMT
Local: Tues, Apr 25 2006 9:25 am
Subject: Re: OOP / language design question
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Carl Banks wrote:
> You know, Python's __init__ has almost the same semantics as C++
> constructors (they both initialize something that's already been
> allocated in memory, and neither can return a substitute object).

There is a significant difference: imagine B is a base type and C a
subclass of B:

When you create an object of type C in Python, while B.__init__ is
executing self is an object of type C (albeit without all the attributes
you expect on your C).

In C++ when the B() constructor is executing the object is an object of
type B. It doesn't become a C object until the C() constructor is
executing.

In other words, the object is constructed in Python before any __init__ is
called, but in C++ it isn't constructed until after all the base class
constructors have returned.


 
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