I need this written in Python 2! I don't know how to solve this. Please make the code easy to understand :(

Given an array of integers, your task is to count the number of duplicate array elements. Duplicate is defined as two or more identical elements. For example, in the array [1, 2, 2, 3, 3, 3], the two twos are one duplicate and so are the three threes. Function Description Complete the function countDuplicates in the editor below. The function must return an integer denoting the number of non-unique (duplicate) values in the numbers array. countDuplicates has the following parameter(s): numbersjnumbers...ubs an aray of integers to process T s numbers T000,0sicn Input Format Format for Custom Testing Sample Case 0 Sample Input Sample Output Explanation n-8 and numbers = [1, 3, 1, 4. 5, 6, 3, 2). The integers 1 and 3 both occur more than once, so we return 2 as our