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 Sequences Sequence Iteration Iterating over Ranges

Just a bit confused.

Not sure what we are appending from my list if there was nothing in the list to begin with. I also wasnt sure what to put in the parentheses after append.

iterating_ranges.py
my_list = []
for my_list in range(0, 10, 1):
    my_list.append(not sure what goes here)
    print(my_list)

1 Answer

This passes:

my_list = []
for val in range(0, 10, 1):
    my_list.append(val)
    print(my_list)

In this case, 'val' can be any word - 'val', 'i', 'index'. It's the variable for each item in the range as it iterates. Although, you should use 'val' because it makes sense per the challenge objective as stated in the instructions. The output will be:

[0]
[0, 1]
[0, 1, 2]
[0, 1, 2, 3]
[0, 1, 2, 3, 4]
[0, 1, 2, 3, 4, 5]
[0, 1, 2, 3, 4, 5, 6]
[0, 1, 2, 3, 4, 5, 6, 7]
[0, 1, 2, 3, 4, 5, 6, 7, 8]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

when executed.

I hope that helps. Happy coding!