[Tutor] Problem with calling class methods stored in a list

[Peter Otten]

Tobias Marquardt wrote:

> Hello,
> 
> I have a class with some class methods that are also stored in a list.
> Now I have a problem calling these methods.
> Essentially the relevant code looks like this:
> 
> class MyClass(object):
> 
>      @classmethod
>      def foo(cls):
>          cls.method_list[0]()
> 
>      @classmethod
>      def bar(cls):
>          print("Hello World")
> 
>      method_list = [bar]

At this point MyClass is not yet defined, so bar has no information about 
it.
 
 
> So foo() takes bar() from the list and tries calls it, which results in
> an error:
> 
> File "aco/antsystem/test.py", line 11, in foo
>      cls.method_list[0]()
> TypeError: 'classmethod' object is not callable
> 
> I guess the reason is that bar() needs to be called on the class like:
> cls.bar(), but how to I achieve this here?
> Any suggestions?

Build the list outside the class:

MyClass.method_list = [MyClass.bar]