clever exit of nested loops
Mark Lawrence
breamoreboy at gmail.com
Wed Sep 26 15:06:09 EDT 2018
On 26/09/18 08:50, vito.detullio at gmail.com wrote:
> Hi
> Today I've added a couple of lines in my source code, and I'm very ashamed of it.
> it "runs", and I know what it does (for now), but it's "too clever".
> I have "abused" the "else" clause of the loops to makes a break "broke" more loops
>
>
> for i in range(10):
> print(f'i: {i}')
> for j in range(10):
> print(f'\tj: {j}')
> for k in range(10):
> print(f'\t\tk: {k}')
>
> if condition(i, j, k):
> break
>
> else: # if there weren't breaks in the inner loop,
> continue # then make anoter outer loop,
> break # else break also the outer one
>
> else:
> continue
> break
>
> the "magic" is in that repeated block... it's so convoluted to read... still it's very useful to omit "signals" variables or the need to refactor it in a function with an explicit return or other solutions.
>
> is there any chance to extends the python grammar to allow something like
>
>
> for i in range(10) and not break:
> print(f'i: {i}')
> for j in range(10) and not break:
> print(f'\tj: {j}')
> for k in range(10):
> print(f'\t\tk: {k}')
>
> if condition(i, j, k):
> break
>
>
> with the semantics of break a loop if an inner loop "broke"?
>
>
>
To me the Ned Batchelder presentation
https://www.youtube.com/watch?v=EnSu9hHGq5o "Loop like a Native" is the
definitive way on how to deal with loops in Python.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
More information about the Python-list
mailing list