for loop stuck in the middle (Python)

Question

I am trying to pop() all the element that less than four by pop one element per time. However I have no idea why my loop stop working in the middle of my list that left a bunch of 1 that didn't pop...

nums =[16, 95, 100, 3, 12, 5, 8, 5, 1, 3, 1, 12, 4, 1, 4, 5, 4, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 2, 1, 1, 1, 1, 4, 1, 4, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1]

for checker in nums:
    if checker < 4:
        nums.pop(nums.index(checker))

print(nums) #[16, 95, 100, 12, 5, 8, 5, 3, 12, 4, 4, 5, 4, 3, 4, 4, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1]

You could just use list comprehension: `nums = [x for x in nums if x >= 4]` — MoonMist, Dec 08 '19 at 04:32

score -2 · Answer 1 · answered Dec 08 '19 at 04:26

-2

This is because you are changing the size of the list in your for loop.

answered Dec 08 '19 at 04:26

Kyle Swanson

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please tell me how can I solve it! – Jiangyifei Zhu Dec 08 '19 at 04:32

for loop stuck in the middle (Python)

1 Answers1