Sure, there will always be some users who will find certain things not 
obvious. Sometimes I'm that user myself.

What did this user think print() returned? What precisely was their 
question? Perhaps if I saw the conversation in context, I would be more 
sympathetic to this.

I can see a difference between (for example) the questions:

"I see that print('Hello world') returns None, but is it safe to assume 
that print will *always* return None? It is not documented anywhere as 
far as I can see."

and

"What does x = print('Hello world') do?"