How about doing it pythonic way then, "everything is a hack on a symbol
table".
Let normal loops remain normal loops.
Let's introduce a special construction:
> for x in iterator as loop_control_object:
> loop_body(loop_control_object)
The iterator in the loop would be wrapped inside another iterator that
would yield everything as the original iterator, but it would also be
controllable through loop_control_object.
Sample implementation:
> def make_control_object(iterator):
> control_object = ControlObject()
> control_object.running = True
> def breakable_iterator():
> for x in iterator:
> yield x
> if not control_object.running:
> return
> return breakable_iterator(), control_object
The control object could have methods that allow sophisticated loop
control, such as breaking, continuing, injecting exceptions, counting
iterations, skipping etc.
The keywords 'break loop_control_object' and 'continue
loop_control_object' could be simply implemented as:
> loop_control_object.do_break()
On Sun, May 12, 2019, 5:36 PM Paul Moore <[email protected]
<mailto:[email protected]>> wrote:
On Sun, 12 May 2019 at 21:06, David Mertz <[email protected]
<mailto:[email protected]>> wrote:
> I thought of 'as' initially, and it reads well as English. But it
felt to me like the meaning was too different from the other
meanings of 'as' in Python. I might be persuaded otherwise.
If you think in terms of "named loops" rather than "labels", "as"
makes a lot more sense.
Every name created with 'as' currently is a regular Python object, with
a memory address, and some methods, that can participate in comparison
(at least equality), that has a type, can be passed as a function
argument, etc. Actually, all that is true of EVERY name in Python other
than keywords.
It seems like none of this would be true of a loop name/label. Hence my
first thought that a different way of introducing the word is more
clear... Maybe we can just prefix lines with labels instead, and add a
'goto' command :-)
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