If `L.append(5)` grows your list, why does `L = L.append(5)` silently destroy it?
Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.
The list colors starts as ["red", "green"]. Add the string "blue" to the end so colors becomes the three-item list ["red", "green", "blue"]. Mutate it in place — do not reassign colors to whatever the call returns.
Hint: append adds one item to the end of a list.