Returning none

[Terry Reedy]

clgonsal at keeshah.penguinpowered.com says...
>
> One of the other ideas I'd proposed was
>the removal of "expression" as a type of statement.

But this would disable the eval-loop behaviour of interactive-mode 
Python that is *SO* handy for learning and testing and which is one of 
the features that attracted me to Python and is one of the features 
distinguishing it from some competitors.

To avoid this, you would have to build knowledge of and variant 
behaviour based upon the operation mode (interactive vs. batch/runtime). 
At present, I believe, the byte-code compiler acts the same regardless 
of whether the input string comes from file, keyboard, or program 
construction.

Terry J. Reedy