this post was submitted on 25 Jun 2024

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19

Why can't I append to list inside of a list comprehension? (lemmy.world)

submitted 2 months ago* (last edited 2 months ago) by librejoe@lemmy.world to c/python@programming.dev

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I'm new to programming a bit, and am learning python so I can learn flask, using the python crash course book. I was learning about list comprehension but it briefly talks about it. If I do

list[list.append(value) for value in range(1, 20)]

it doesn't work. Would this be some sort of recursive expression that is not possible?

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[–] decivex@yiffit.net 1 points 1 month ago* (last edited 1 month ago) (1 children)

I know I'm being somewhat pedantic but range() returns an iterable range type, not a list, in python 3.

[–] bitfucker@programming.dev 1 points 1 month ago

Not at all. It is indeed helpful to differentiate between an iterable and literal list. After all, sometimes it will bite you in the ass when you don't differentiate between the two.