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Python Python Collections (2016, retired 2019) Slices Slice Functions

Ryan White
Ryan White
32,822 Points

I don't understand. This answer works in workspaces.

I tried this way:

def reverse_evens(list): return list[::-2]


def reverse_evens(list): return list[-1::-2]

def first_4(list):
    return list[0:4]

def first_and_last_4(list):
    return list[0:4] + list[-4:]

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

def reverse_evens(list):
    return list[::-2]

1 Answer

Chris Howell
.a{fill-rule:evenodd;}techdegree seal-36
Chris Howell
Python Web Development Techdegree Graduate 49,610 Points

This actually had me stumped to but you really have to read into it and consider other sides of the lists going into it.

# Example 1
numbers1 =  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# indices = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] - numbers1 index list

# even_indices = [0,2,4,6,8] which reversed is -> [8,6,4,2,0]
# expected_output = [9, 7, 5, 3, 1]

def reverse_evens(list):
    return list[::-2]

reverse_evens(numbers1) # returns [10, 8, 6, 4, 2]

So is that the right return? Nope. I mean it is "ever other index" but its the wrong items.

HINT You want the even index items first, then you want them in reversed order.