Single Pound # comments versus Double Pound ## comments

[Jeff Epler]

On Fri, Oct 04, 2002 at 04:04:00PM -0700, Terry Hancock wrote:
> ###
>   This might be a block comment in some hypothetical
>   future version of Python. Although I'm not holding
>   my breath.
> ###
> 
> Might be very sensible, analogous to the """ string
> definitions.
[...]
> Except that it could be more unambiguous --
> such as being used to block out code even within
> expressions:
> 
> this_is_a_dict = {
>                    'spam':1,
> ###
  # Didn't really want this part, but might later:
> 
>                    'ham':3,
>                    'eggs':4,
> ###
>                    'morespam':2
>                  }

How is this "more unambiguous", given that the code fragment above has a
meaning today?

Jeff