Reminder for how decorators work, so I don't need to look it up.

decorator.py

def method_decorator(argument, argument2):
    # decorator name used here.

    def decorator(func, argument=argument, argument2=argument2):
        # the function passed and we need to pass the arguments as well. 
        # I couldn't get it to work otherwise. 
        def wrapped(self, argument=argument, argument2=argument2, *fargs, **fkwargs):
            # the first argument is self, this is a decorator for methods.
            # passing the arguments again. Otherwise trouble. 
            # here we also get the function arguments. 
            
            # do something with arguments that you had. 
            
            # call the original function
            result = func(self, *fargs, **fkwargs)
            
            # return the result. 
            return result
        return wrapped
    return decorator

class MyClass:
       
    @method_decorator('hello', 'world')
    def method(self):
        pass