iven a string with duplicate characters in it. Write a program to generate a list that only contains the duplicate characters. In other words, your new list should contain the characters which appear more than once.

Given a string with duplicate characters in it. Write a program to generate a list that only contains the duplicate characters. In other words, your new list should contain the characters which appear more than once.

Suggested Approach

• Used two nested for loops.
• The first for loop iterates from 0 to range(len(input_str)).
• The second for loop iterates from first_loop_index + 1 to range(len(input_str)). The reason you want to start at first_loop_index + 1 in the nested inner loop is that the outer loop already checks the current character. In the nested inner loop, you want to check the remaining characters in the input string.
• If the current character of the outer loop matches the character of the nested loop AND the character is not already IN the duplicate list, append it to the list
• nhantran

  Sample Output 1

  List of duplicate chars: ['n', 'a']

  Sample Input 2

  pneumonoultramicroscopicsilicovolcanoconiosis

  Sample Output 2

  List of duplicate chars: ['p', 'n', 'u', 'm', 'o', 'l', 'r', 'a', 'i', 'c', 's']

  Sample Input 3

  pulchritudinous

  Sample Output 3

  List of duplicate chars: ['u', 'i']

  Sample Input 4

  orden

  Sample Output 4

  List of duplicate chars: []