Adding/calling/setting Class attributes outside of Class definiton

I have seen this coding pattern in codes I am (re)writing:

class Outside(object):
    pass

Outside.example = 10.

My instinct was that I didn't like it! I'd prefer:

class Inside(object):
    example = 10.

Are there any advantages or situations where the former is preferred? I guess if you are inheriting a complicated class, you might want to deliberately take advantage of the fact that setting attributes outside the class will be late-binding? But this seems fairly hellish...