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Python | Program to print duplicates from a list of integers
  • Difficulty Level : Easy
  • Last Updated : 26 Oct, 2018


Given a list of integers with duplicate elements in it. The task to generate another list, which contains only the duplicate elements. In simple words, the new list should contain the elements which appear more than one.

Examples :

Input : list = [10, 20, 30, 20, 20, 30, 40, 50, -20, 60, 60, -20, -20]
Output : output_list = [20, 30, -20, 60]


Input :  list = [-1, 1, -1, 8]
Output : output_list = [-1]

Below is the implementation :

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# Python program to print 
# duplicates from a list 
# of integers
def Repeat(x):
    _size = len(x)
    repeated = []
    for i in range(_size):
        k = i + 1
        for j in range(k, _size):
            if x[i] == x[j] and x[i] not in repeated:
                repeated.append(x[i])
    return repeated
  
# Driver Code
list1 = [10, 20, 30, 20, 20, 30, 40
         50, -20, 60, 60, -20, -20]
print (Repeat(list1))
      
# This code is contributed 
# by Sandeep_anand

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Output :

[20, 30, -20, 60]

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