Python program to print duplicates from a list of integers?

PythonServer Side ProgrammingProgramming

Here we are trying to print all the duplicate numbers from a list of numbers. So, we are trying to print all the numbers which occur more than once in a list (not unique in the list).

Examples

Input: given_list = [ 3, 6, 9, 12, 3, 30, 15, 9, 45, 36, 12]
Output: desired_output = [3, 9, 12]
Input: given_list = [-27, 4, 29, -27, -2 , -99, 123, 499, -99]
Output: desired_output = [-27, -99]

Below is the code to find the duplicates elements from a given list −

 Live Demo

lst = [ 3, 6, 9, 12, 3, 30, 15, 9, 45, 36, 12, 12]
dupItems = []
uniqItems = {}
for x in lst:
   if x not in uniqItems:
      uniqItems[x] = 1
   else:
      if uniqItems[x] == 1:
         dupItems.append(x)
      uniqItems[x] += 1
print(dupItems)

Output

[3, 9, 12]

Above program will work not only for a list of integers but others too −

Input: given_list = ['abc','def','raj','zack','abc','raj']
Output: output_returned= ['abc', 'raj']
raja
Published on 19-Feb-2019 16:29:27
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