getattr

class a:
    def __init__(self,a,b):
        self.a=a
        self.b=b

aa = a(1,2)

dictionary = {key: getattr(aa, key) for key in dir(aa) if not key.startswith('_')}
list_with_keys = [key for key in dir(aa) if not key.startswith('_')]
list_with_values = [getattr(aa, key) for key in dir(aa) if not key.startswith('_')]