Remove the last N elements of a list
Solution 1:
Works for n >= 1
>>> L = [1,2,3, 4, 5]
>>> n=2
>>> del L[-n:]
>>> L
[1, 2, 3]
Solution 2:
if you wish to remove the last n elements, in other words, keep first len - n elements:
lst = lst[:len(lst)-n]
Note: This is not an in memory operation. It would create a shallow copy.