Attributes and built-in types

[Dave Opstad]

Is it just an implementation limitation that attributes cannot be 
assigned to instances of internal types?

---------------------------
>>> x = 4
>>> type(x)
<type 'int'>
>>> class Test(int):
...   pass
... 
>>> y = Test(4)
>>> type(y)
<class '__main__.Test'>
>>> y.someattr = 10
>>> x.someattr = 10
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: 'int' object has no attribute 'someattr'
---------------------------

When I did a dir(int) there was no __dict__ entry, but a dir(Test) 
showed a __dict__entry, which is why (presumably) the attribute 
assignment worked for Test but not for int.

Just curious...

Dave