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I'm trying to solve reverse_evens function like this but it gives me an error:

Why it happens?? I have tried this on python console and it's ok!

slices.py
```def first_4(iterable):
return iterable[:4]

def first_and_last_4(iterable):
r = iterable[:4]
r.extend(iterable[-4:])
return r

def odds(iterable):
return iterable[1::2]

def reverse_evens(iterable):
return iterable[::-2]
```

So step through the evens first with `[::2]` and store that temporarily. Then return the reverse of that using `[::-1]`.