If you write like
n = str(input())
n = n.split()
print(n)
That will work. But if you try to do it with integers, you will get
Do you want to separate several numbers? 1 2 3 -> [1, 2, 3]
n = str(input())
n = n.split()
numbers = [int(i) for i in n]
print(numbers)
Or split a number in numeral? 123 -> [1, 2, 3]
n = str(input())
numbers = [int(i) for i in n]
print(numbers)
Use Nikhil answer, if you want to split a number with delimiters 1%3 -> [1, 3]