[Python] Difficulty Interpreting This Exam Question

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Here's the original Problem, it's a linked list environment diagram of sorts.

def slice_up(s):
copy = s
t = [copy]
while len(s) > 1:
t.append(s[:len(s)-1])
s.pop()
s[0] = len(s)
return t

t = [3, 4, 5]
print(slice_up(t))
print(t)


So here's how I tried to map it out:

slice_up([3, 4, 5])
copy = [3, 4, 5]
t = [[3,4,5]] ([3,4,5] = [[3, 4, 5]])
while len([3,4,5]) > 1 (yes, 3 > 1)
t.append(s[ :len(s)-1]) len of s is 3 so s[:2]?
s.pop() pops the last digit of s so [3,4]
s[0] = len(s) first index of s = 2 so [2,4]?
return t


So I ended up getting [[3, 4, 5], 5] as the return statement for line 11 and [2, 4] for print(t) which ended up being very wrong.

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