Python importing class attributes into method local namespace

Question

I have been wondering for a while if there is easier way to assign class attributes to method local namespace. For example, in dosomething method, I explicitly make

Answer 1

I found another way:

def dosomething(self):
    for key in ['a', 'b']:
       exec('{} = self.{}'.format(key, key))

    return(a + b)

I don't know if this is dangerous or not. Would be great if someone can comment on this.