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 Sequences Sequence Iteration Iterating over Ranges

Posted by Carson Evans
Carson Evans
1,016 Points

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

Peter Vann
Peter Vann
36,427 Points
Peter Vann
Peter Vann
36,427 Points

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!