How to resolve this challenge?

Question

Make a function named reverse_evens that accepts a single iterable as an argument. Return every item in the iterable with an even index...in reverse.
For example, with [1, 2, 3, 4, 5] as the input, the function would return [5, 3, 1].
so when i create the function, the result is right in my console
But not right in challenge
this is my code
def reverse_event(data):
     return data[-1::-2]
```slices.py
def first_4(data):
    return data[:4]
def firstandlast_4(data):
    return data[:4] + data[-4:]
def odds(data):
    return data[1::2]
def reverse_evens(data):
    return data[-1::-2]
```

Steven Parker · Answer

Someone asked nearly the same question just 20 minutes before (https://teamtreehouse.com/community/first-slice)!  The trick is that this strategy will work with some test data, but not every time.   You managed to test with "lucky data".
To create a function that will work reliably with all data, there are two basic approaches:
- compute which item to start with based on the size (or actually the "even or odd-ness") of the list, or
- use one slice to extract all the even indexed values, and then another slice to reverse them
Either method will work when implemented correctly.  Bonus hint: the second method might be easier to implement.

Welcome to the Treehouse Community

Looking to learn something new?

mochammad yalinulloh

mochammad yalinulloh

How to resolve this challenge?

1 Answer

Steven Parker

Steven Parker

Oleksandr Krasnovskyy

Oleksandr Krasnovskyy

Oleksandr Krasnovskyy

Oleksandr Krasnovskyy

Steven Parker

Steven Parker