How can `id()` prove whether `L = L + L` built a new list while `L.clear()` changed the same one in place?
Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.
The concatenation operator + joins two lists into a brand-new list. Starting from values = [1, 2, 3, 4], build a new list that is values followed by a second copy of itself, and assign it to doubled. Concatenation returns a new object — it must not change values.