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Showing content from https://mail.python.org/pipermail/python-dev/2001-February/012644.html below:

[Python-Dev] Type/class differences (Re: Sets: elt in dict, lst.include)

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> On Mon, Feb 05, 2001 at 01:37:39PM -0500, Guido van Rossum wrote:
> > Now, can you do things like this:
> [example cut]
> 
> No, it would have to be written like this:
> 
>     >>> from types import *
>     >>> class MyInt(IntType): # add a method
>             def add1(self): return self.value+1
> 
>     >>> i = MyInt(10)
>     >>> i.add1()
>     11
>     >>>
> 
> Note the value attribute.  The IntType.__init__ method is
> basicly:
> 
>     def __init__(self, value):
>         self.value = value

So, "class MyInt(IntType)" acts as a sort-of automagical "UserInt"
class creation?  (Analogous to UserList etc.)  I'm not sure I like
that.  Why do we have to have this?

--Guido van Rossum (home page: http://www.python.org/~guido/)

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