"Hui-Ling Huang" [email protected] wrote:

Have a minor question: is it compulsory to utilise Itertools we implemented in previous tasks?

The instructions and marking rubric state no such requirement. However, do recall there is a style mark for "logical and elegant" implementations. If you could implement a later task more elegantly using itertools and instead reimplement a bunch of unnecessary, repetitive logic, you might not receive that mark.