On 2019-05-12 10:44, Steven D'Aprano wrote:
On Sun, May 12, 2019 at 11:16:21AM +0200, Oleg Broytman wrote:
On Sun, May 12, 2019 at 01:36:28AM -0700, Elias Tarhini <elt...@gmail.com>
wrote:
> If I may propose `break n` as a replacement for the original message's
> `break break ... break`, where n>0 is the number of contiguous loops to
> break out of and `break 1` is synonymous with `break`. Seems easier on my
> eyes/noggin than counting out the individual `break` statements.
This is very much error-prone because on any refactoring (increasing
or decreasing the number of loop levels) one must increase/decrease all
numbers in internal loops.
Labels are at least stable.
Indeed.
Go has labels for loops:
Label:
for { ...
break Label
}
as does Rust:
'label: while condition:
{
...
break label
}
We can't use the same syntax in Python, but we might write it like this:
@label while condition:
block
break label
and similar with for loops:
@outer for x in range(100):
@inner for y in range(3):
if x == y == 1: break # like ``break inner``
if x == y == 2: break outer
print(x, y)
# break inner jumps to here
# break outer jumps to here
@ reminds me too much of decorators.
How about this:
<label> while condition:
block
break label
<outer> for x in range(100):
<inner> for y in range(3):
if x == y == 1: break # like ``break inner``
if x == y == 2: break outer
print(x, y)
# break inner jumps to here
# break outer jumps to here
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