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In python I'm trying to write nested loops in one line. I've seen a lot of examples, but in all of them the inner iterable variable is different compared to the outer one. So in my case, it won't work. Here's my try:

my_list = [for ip in subnet for subnet in subnets]

where I'm getting:

Unresolved reference 'subnet'
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  • checkout stackoverflow.com/questions/24591917/nested-loop-python Commented Nov 10, 2022 at 16:53
  • 1
    @YUVI_1303 it seems you didn't read my question :) Commented Nov 10, 2022 at 16:58
  • [ip for subnet in subnets for ip in subnet] Commented Nov 10, 2022 at 16:59

2 Answers 2

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There is a syntax error, it should be

my_list = [ip for subnet in subnets for ip in subnet]
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3 Comments

didn't work in this case: [pool.apply_async(handle_ip, (ip,)) for ip in subnet for subnet in subnets]
It's unintuitive, but you have to flip the loop conditions to ensure that the loop variables are declared in the proper order. [pool.apply_async(handle_ip, (ip,)) for subnet in subnets for ip in subnet]
You're 100% right, edited answer above.
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Try with this

my_list = [[ip for ip in subnet] for subnet in subnets]

is a way to nest loops in list comprehension

Can check this too https://www.geeksforgeeks.org/nested-list-comprehensions-in-python/

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3 Comments

That inner comprehension should be [ip for ip in subnet]. It doesn't make sense to start a list comprehension with for.
this doesn't even compile
@0x5453 sorry my mistake, i forgot to put ip at the start. I'm going to edit it.

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