Auto-register class methods using decorator

Question

I want to be able to create a python decorator that automatically "registers" class methods in a global repository (with some properties).

Example code:

class my_class(object):

    @register(prop1,prop2)
    def my_method( arg1,arg2 ):
       # method code here...

    @register(prop3,prop4)
    def my_other_method( arg1,arg2 ):
       # method code here...

I want that when loading is done, somewhere there will be a dict containing:

{ "my_class.my_method"       : ( prop1, prop2 )
  "my_class.my_other_method" : ( prop3, prop4 ) }

Is this possible?

Answer 1

Here's a little love for class decorators. I think the syntax is slightly simpler than that required for metaclasses.

def class_register(cls):
    cls._propdict = {}
    for methodname in dir(cls):
        method = getattr(cls, methodname)
        if hasattr(method, '_prop'):
            cls._propdict.update(
                {cls.__name__ + '.' + methodname: method._prop})
    return cls


def register(*args):
    def wrapper(func):
        func._prop = args
        return func
    return wrapper


@class_register
class MyClass(object):

    @register('prop1', 'prop2')
    def my_method(self, arg1, arg2):
        pass

    @register('prop3', 'prop4')
    def my_other_method(self, arg1, arg2):
        pass

myclass = MyClass()
print(myclass._propdict)
# {'MyClass.my_other_method': ('prop3', 'prop4'), 'MyClass.my_method': ('prop1', 'prop2')}