Modifying Element with Index in Python

January 14, 2024

I am a beginner in Python. I am learning currently how to Modify an element with index

MyCode:

data = [4, 6, 8]
for index, value in enumerate(data):
    data[index] = data[index] + 1
    value = value * 2


print(data)
print(value)

Terminal Output:

[5, 7, 9]
16

Terminal Output Expectation:

[5, 7, 9]
[8, 12, 16]

Why didn’t I get my expected output? Now I have tried to define an empty_list before my FOR loop and then add the VALUE variable to it, then print(the_empty_list)

Here:

data = [4, 6, 8]
empty_list = []
for index, value in enumerate(data):
    data[index] = data[index] + 1
    value = value * 2
    **(How to add VALUE to the empty_list)**

print(data)
print(empty_list)

** **I am finding the asterisked part difficult. Who knows what I should do here?

>Solution :

If your list is empty you can’t access it with an index. Use append method to add new elements:

data = [4, 6, 8]
empty_list = []
for index, value in enumerate(data):
    data[index] = data[index] + 1
    value = value * 2
    empty_list.append(value)

print(data)
print(empty_list)

Output: