Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Collections (2016, retired 2019) Lists Creating lists

Why am I getting an error?

I don't know why I am getting an error when there are 6 items in the list....

lists.py
my_list = [1, 2, 3, 'World']
second_list = ["World", "Hi"]
my_list += second_list

1 Answer

I think the issue is you need 3 numbers two strings and one list and you only have 3 numbers one string and one list. Try adding another string and instead of "+=" use the append method. Also a list of two items is interpreted as one item.

This code should work

my_list = [1, 2, 3,"string", "World"]
second_list = ["World", "Hi"]
my_list.append(second_list)

Thank you! So it was just a problem with the understanding of the question then my bad!!