For and while

Question

I need to remove all objects of a list. While will do that, but what about for?
a=[1,2,3,4,5]
while a:
a.pop()
print(a)
—————-
for i in a:
a.remove(i)
print(a)

Why does the 2nd one not work?

Answer 1

The second one doesn't work because for loop goes to next element of list...
Suppose a=[1,2,3,4,5]
On 1st iteration I is 0th element
And the list becomes[2,3,4,5]
on 2nd iteration it becomes 1st element means 3
And so on. .... Check the code
Better way to delete is del a[:]
https://code.sololearn.com/ckXcOI3WOeoA/?ref=app

Answer 2

https://code.sololearn.com/c4buUZ9yCOB7/?ref=app

Answer 3

Chen Zhang Whichever answer helped you most mark it as correct answer by ticking the checkmark

Answer 4

You can remove items by for loops, but not strictly like you said, but by using:
for i in range(len(a)-1, -1, -1):
a.remove(a[i])

Answer 5

Thank you all! I understand this question now