Python split function to extract the first element and last element

Question

  python code --> ",".join("one_two_three".split("_")[0:-1])

I want to take the 0th element and last element of delimited string and create a new string put of it . The code should delimited string of any length

Expected output : "one,three"

The above code gives me

   'one,two'

Can some one please help me

Answer 1

[0:-1] is a slice, it returns all the elements from 0 to the 2nd-to-last element.

Without the third stride parameter, which is used for getting every Nth element, a slice can only return a contiguous portion of a list, not two separate items.

You should select the first and last separately, then concatenate them.

items = "one_two_three".split("_")
result = f"{items[0]},{items[-1]}"