Yes it is. Rhodri is correct, although I admit that I hadn't realised
this point myself until he pointed it out. (That is why until now I've
been writing examples like "spam?.eggs?.cheese?.aardvark" which is redundant.)
Again, one of the most vocal advocates of the PEP gets the semantics wrong!
`spam?.eggs?.cheese?.aardvark` is NOT redundant for `spam?.eggs.cheese.aardvark`. The two expressions simply do different things, but in a way guaranteed to assure that also everyone gets the actual behaviors wrong.
Hint, run this before each expression:
spam.eggs.cheese = None