In python Why is this :: symbol is used can anyone would like to explain me this

Question

I have one program in which that symbol was used

a=[5,10,15,20,25]
del a[::2]
print(a)

And the output was
[10, 20]

Answer 1

These are two separate colons.
a[start:stop:step]
Take this & the next lessons again:
https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2453/

Answer 2

so in your sample the code means:

a=[5,10,15,20,25]
del a[::2]

delete every 2nd element, starting from 1st element up to the last element. 5, 15 and 25 will be deleted. 20 and 20 remains.

Answer 3

can you show us the complete part / line of code. I estimate you mean this [::-1]?

Answer 4

[::2] is list slicing
in that context it means removing every other element
list slicing has many aplocations... 😄

Answer 5

Actually i did reached uptil the list slicing 😌😅
Then to but i know understood the concept properly 😎👍.I won't forget.

thank guys for ur help