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!

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 Functional Python Functional Workhorses Map

Olivia Cooksey
Olivia Cooksey
3,564 Points
Posted by Olivia Cooksey
Olivia Cooksey
3,564 Points

backwards = [ 'tac', 'esuoheerT', 'htenneK', [5, 4, 3, 2, 1], ]

Please see why this will not work and help solve.

maps.py 
backwards = [
    'tac',
    'esuoheerT',
    'htenneK',
    [5, 4, 3, 2, 1],
]

def reverse(y):
    y.reverse() 
    return y

1 Answer

Steven Parker
Steven Parker
227,126 Points
Steven Parker
Steven Parker
227,126 Points

This would work on a list, but the goal is to reverse any kind of iterable including strings. And strings don't have a reverse() method, so you can't count on being able to call y.reverse().

Hint: any iterable can be slice‍d, and the optional step value can also control the direction.