[Python] In Python how do you pop the first n elements of a list and append these to a new...

How do I pop the first n elements of a list and append these to a different list?

so, for example.

mylist = []
n = 3
mainlist = [5,4,3,2,1]


How would I make it so I have

mainlist = [2,1]

mylist = [5,4,3]


I've tried the following but it doesn't work as the placement of the elements are changing after each loop:

for i in list(range(n)):
mylist.append(mainlist.pop(i))

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