vito.detul...@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:
I think that is much too close to a logical expression. If I were to add a
way to break out of an inner loop I'd introduce a fullblown (intra-function)
goto.
So far I'm happy with generators; in my actual use cases something like
def g():
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}')
yield i, j, k
for i, j, k in g():
if condition(i, j, k):
break
looks natural. Another option might be a dedicated exception:
class Break(Exception):
pass
try:
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):
raise Break
except Break:
pass
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