Keep duplicates in a list in Python

Question

I know this is probably an easy answer but I can\'t figure it out. What is the best way in Python to keep the duplicates in a list:

x = [1,2,2,2,3,4,5,6,6,7         


        

Answer 1

Not efficient but just to get the output, you could try:

import numpy as np

def check_for_repeat(check_list):
    repeated_list = []

    for idx in range(len(check_list)):
        elem = check_list[idx]
        check_list[idx] = None

        if elem in temp_list:
            repeated_list.append(elem)

    repeated_list = np.array(repeated_list)

    return list(np.unique(repeated_list))