Can't set attributes on instance of “object” class

Question

So, I was playing around with Python while answering this question, and I discovered that this is not valid:

o = object()
o.attr = \'hello\'

<

Answer 1

https://docs.python.org/3/library/functions.html#object :

Note: object does not have a __dict__, so you can’t assign arbitrary attributes to an instance of the object class.