setattr and variable names: bug or feature?

[Gerrit Holl]

Dear bottomless information source,

>>> class Foo:
...     pass
...
>>> setattr(Foo, '', '')
>>> setattr(Foo, '`', '')
>>> setattr(Foo, '\'', '')
>>> setattr(Foo, '!@#{}\0\0\0', '')
>>> dir(Foo)
['', '!@#{}\000\000\000', "'", '__doc__', '__module__', '`']

Is this a bug or a feature, or None of both?

just-found-it-interesting-ly y'rs - gerrit