some_list = ['a', 'b', 'b', 'c', 'b', 'd', 'm', 'n', 'n'] # for value in some_list: # if some_list.count(value) > 1: # if value not in duplicates: # duplicates.append(value) # print(duplicates) # print (set(some_list)) # dup= set() # lis1= set(some_list) # for i in lis1: # count=0 # for j in some_list: # if j ==i: # count+=1 # if count > 1: # dup.add(i) # print (dup) # duplicates = set() # list_set = set(some_list) # for char in list_set: # count = 0 # for item in some_list: # if item == char: # count += 1 # if count > 1: # duplicates.add(char) # print(duplicates) duplicates =[] for i in range(len(some_list)): for j in range(i+1, len(some_list)): if some_list[i] == some_list[j]: if some_list[i] not in duplicates: duplicates.append(some_list[i]) print(duplicates)