Remove Duplicate Elements by Index from Another List in Python

When it is required to remove duplicate elements index from other list, the ‘enumerate’ attribute, the list comprehension and a simple iteration are used.

Example

Below is a demonstration of the same

my_list_1 = [4, 5, 6, 5, 4, 7, 8, 6]
my_list_2 = [1, 7, 6, 4, 7, 9, 10, 11]

print("The first list is :")
print(my_list_1)
print("The second list is :")
print(my_list_2)

temp_set = set()
temp = []

for index, value in enumerate(my_list_1):
   if value not in temp_set:
      temp_set.add(value)
   else:
      temp.append(index)

my_result = [element for index, element in enumerate(my_list_2) if index not in temp]

print("The result is :")
print(my_result)

Output

The first list is :
[4, 5, 6, 5, 4, 7, 8, 6]
The second list is :
[1, 7, 6, 4, 7, 9, 10, 11]
The result is :
[1, 7, 6, 9, 10]

Explanation

• Two lists of integers is defined and is displayed on the console.
• An empty set is created and defined as ‘temp_set’.
• An empty list is created and defined as ‘temp’.
• The first list is iterated over using ‘enumerate’ attribute, and the elements of the first list are compared with the elements of the second list.
• If they match, the element is stored in a list.
• A list comprehension is used to iterate over the elements of second list and check if enumeration of elements of second list are present in the newly created list.
• It is converted to a list.
• This is assigned to a variable.
• This is displayed as output on the console.