Is there are good DRY fix for this painful design pattern?

[Kirill Balunov]

This validation can be also done with the use of annotations, while I find
it super awful, I put this for one more example:

from functools import wraps
def validate(func):
    @wraps(func)
    def _wrap(self, *args, **kwargs):
        variables = func.__annotations__.keys()
        kwargs.update(zip(variables, args))
        for var in variables - kwargs.keys():
            kwargs[var] = getattr(self, var)
        return func(self, **kwargs)
    return _wrap


class Foo:
    def __init__(self, bashful, doc, dopey, grumpy,
                       happy, sleepy, sneezy):
        self.bashful = bashful
        self.doc = doc
        self.dopey = dopey
        self.grumpy = grumpy
        self.happy = happy
        self.sleepy = sleepy
        self.sneezy = sneezy

    @validate
    def spam(self, bashful:'Any'=None, doc:'Any'=None, dopey:'Any'=None,
                   grumpy:'Any'=None, happy:'Any'=None, sleepy:'Any'=None,
                   sneezy:'Any'=None):

        return bashful, doc, dopey, grumpy, happy, sleepy, sneezy


a = Foo(1,2,3,4,5,6,7)

a.spam(grumpy='Hello')

With kind regards,
-gdg