Question

how to find an position at item n​

Answer 1

Answer:

Python – Find Index or Position of Element in a List. To find index of the first occurrence of an element in a given Python List, you can use index() method of List class with the element passed as argument. The index() method returns an integer that represents the index of first match of specified element in the List.

Answer 2

Explanation:

colour_index = sel_pos%(len(colours))