Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Python Collections (Retired) Lists Redux Manipulating Lists

King Penson II
King Penson II
16,413 Points

List doesn't have correct items in it

When I preview the output, it's showing the right numbers, not really sure what I'm doing wrong

lists.py
the_list = ["a", 2, 3, 1, False, [1, 2, 3]]

# Your code goes below here
the_list.insert(0, the_list.pop(3))
the_list.remove('a')
the_list.remove(False)
the_list.remove([1, 2, 3])

the_list.extend(range(2, 21))

1 Answer

rydavim
rydavim
18,785 Points

When I preview your code, the list I get is: [1, 2, 3, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20], which includes the numbers 2 and 3 twice. Make sure your extend isn't duplicating numbers that are already in the list. Happy coding!