The "loop and a half"

[bartc]

On 07/10/2017 00:43, Steve D'Aprano wrote:
> On Sat, 7 Oct 2017 12:24 am, bartc wrote:
> 
>> print ("Enter blank expression to quit.")
> 
> 
> I *despise* programs that do that, and would cheerfully and unapologetically
> take their designers, disguise them as a lettuce, and stake them out to be
> nibbled to death by snails.
> 
> At the interactive prompt, I am frequently hitting Enter on a blank line,
> either by accident, or deliberately to break up the calculations into groups,
> or just to give myself time to think.
> 
> Blank lines should be treated as "do nothing" and simply ignored, and there
> should be an explicit QUIT command.


Um, that actually follows what interactive Python does. If you type this 
(I'm using <<< as the prompt as >>> confuses my newsreader's quoting 
system):

  <<< def fn():
  <<<    pass
  <<<    pass

At this point, you can break out by pressing the key for 'eof', or by 
pressing Enter at the start of a line. Even though a blank line is legal 
Python syntax.

(Most of my real interactive programs with a command line interface 
programs use Escape, quit, exit, q or x to finish.

Interactive Python requires quit() or exit(), complete with parentheses. 
Unless you've redefined quit and exit as something else, then you have 
to crash out by other means.)

-- 
bartc