FAQ: Creating and Modifying a List in Python - Growing a List: Plus (+)

This community-built FAQ covers the “Growing a List: Plus (+)” exercise from the lesson “Creating and Modifying a List in Python”.

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This exercise can be found in the following Codecademy content:

Computer Science
Data Science

FAQs on the exercise Growing a List: Plus (+)

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2 posts were split to a new topic: Why would we append our data rather than just modify the list?

Apart from the speed, is there any differences between using

list.append('newElement')

and

list += ['newElement']
1 Like

Good query, yes there is a difference.

Please check this answer for a little more info-

Website says this won’t work:
my_list = [1, 2, 3]
my_list + 4

Instead, if we want to add a single element to a list, use brackets:
my_list + [4]

I do this, print the list, and it doesn’t include ‘4’. Please look at the attached picture.

That expression does not mutate the list. To mutate, we would use an assignment operator…

my_list += [4]

or,

my_list = my_list + [4]

or,

my_list.append(4)

Do you see the picture of codecademy’s website I posted? They are wrong in their instruction?

Mostly correct, save for neglecting to add that assignment is necessary.

Mostly correct? Except, neglecting what would actually make the code work? Haha. Thank you for your instruction. I appreciate it.

1 Like