Am 26.09.18 um 12:28 schrieb Bart:
On 26/09/2018 10:10, Peter Otten wrote:
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
For all such 'solutions', the words 'sledgehammer' and 'nut' spring to
mind.
Remember the requirement is very simple, to 'break out of a nested loop'
(and usually this will be to break out of the outermost loop). What
you're looking is a statement which is a minor variation on 'break'.
Which is exactly what it does. "raise Break" is a minor variation on
"break".
Not
to have to exercise your imagination in devising the most convoluted
code possible.
To the contrary, I do think this solution looks not "convoluted" but
rather clear. Also, in Python some other "exceptions" are used for a
similar purpose - for example "StopIteration" to signal that an iterator
is exhausted. One might consider to call these "signals" instead of
"exceptions", because there is nothing exceptional, apart from the
control flow.
Christian
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