mrstephengross schrieb:
> I've got an interesting problem with my class hierarchy. I have an
> outer class, in which two nested classes are defined:
>
> class Outer:
> class Parent:
> def __init__ (self):
> print "parent!"
> class Child(Parent):
> def __init__ (self):
> Outer.Parent.__init__(self)
> foo = Child()
>
> Note that the second nested class (Outer.Child) inherits from the
> first nested class (Outer.Parent). When I run the above code, python
> reports a name error:
>
> Traceback (most recent call last):
> File "./temp.py", line 3, in ?
> class Outer:
> File "./temp.py", line 13, in Outer
> foo = Child()
> File "./temp.py", line 11, in __init__
> Outer.Parent.__init__(self)
> NameError: global name 'Outer' is not defined
>
> Apparently, python doesn't like having an instance of a derived nested
> class present in the outer class. Interestingly enough, if I change
> the foo variable to an instance of the parent class:
>
> foo = Parent()
>
> everything is hunky-dory. Is there some syntax rule I'm breaking here?
It's simple - you try to refer to Outer whilst Outer itself is being
created. A much simpler version of your problem is this:
class Foo:
foo = Foo()
You have to live with that. Just do
Outer.foo = Outer.Parent()
after your class-statement to achieve the same result.
Diez
--
http://mail.python.org/mailman/listinfo/python-list
