Re: question about for cycle

On Sep 29, 8:19 am, George Sakkis <george.sak...@xxxxxxxxx> wrote:
On Sep 29, 10:34 am, "fdu.xia...@xxxxxxxxx" <fdu.xia...@xxxxxxxxx>
wrote:



tokl...@xxxxxxxxx wrote:

> On 29 sep, 12:04, "fdu.xia...@xxxxxxxxx" <fdu.xia...@xxxxxxxxx> wrote:

>> for i in generator_a: # the first "for" cycle
>> for j in generator_b:
>> if something_happen:
>> # do something here ..., I want the outer cycle to break
>> break

> Do you like this?

> generator_ab = ((x, y) for x in generator_a for y in generator_b)
> for i, j in generator_ab:
> if condition:
> # do something
> break

In this case, the tuple generator_ab must be generated first.
George

You can get specific break points by expanding the for loop into a
while loop, and this is perhaps why it has never been implemented with
for loops.
ctr_a=0
ctr_b=0
while ctr_a < len(generator_a):
this_el_a = generator_a[ctr_a]

while ctr_b < len(generator_b):
this_el_b = generator_b[ctr_ b]
if something_happen:
ctr_b = len(generator_b) ## break this loop
if something_else:
ctr_a = len(generator_a) ## break outer while loop
ctr_b += 1
ctr_a += 1

.

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