Write A Python Program To Concatenate Two Lists Index-wise

Chapter: Python Last Updated: 15-05-2023 15:06:41 UTC

Program:

            /* ............... START ............... */
                
def concatenate_lists(list1, list2):
    if len(list1) != len(list2):
        raise ValueError("Lists must have the same length.")

    concatenated_list = []
    for i in range(len(list1)):
        concatenated_list.append(list1[i] + list2[i])

    return concatenated_list

# Test the program
list1 = [1, 2, 3]
list2 = [4, 5, 6]
result = concatenate_lists(list1, list2)
print(result)

                /* ............... END ............... */
        

Output

[5, 7, 9]

Notes:

• The concatenate_lists function takes two lists as input, list1 and list2. Before concatenating the lists, the function checks if they have the same length. If they have different lengths, a ValueError is raised to indicate that the lists cannot be concatenated.
• Next, the function creates an empty list called concatenated_list to store the concatenated values. It then iterates through the indices of list1 (or equivalently, list2, since they have the same length) using a for loop.
• Inside the loop, it appends the sum of the elements at the corresponding indices of list1 and list2 to the concatenated_list.
• Finally, the function returns the concatenated_list.
• In the test case, we create two lists list1 and list2 with the elements [1, 2, 3] and [4, 5, 6] respectively. We then call the concatenate_lists function, passing list1 and list2 as arguments. The function concatenates the lists index-wise, resulting in the list [5, 7, 9]. Finally, we print the concatenated list to the console.

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