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Austin Kosero
802 PointsWhat is the error with my reverse_evens function
def reverse_evens(a): return a[-1::-2]
def first_4(x):
return x[:4]
def first_and_last_4(y):
return y[:4]+ y[-4:]
def odds(z):
return z[1::2]
def reverse_evens(a):
return a[-1::-2]
1 Answer
Steven Parker
231,248 PointsYou're half right. Your method will work when the list has an odd number of items. But when the list has an even number of items, it will return reverse odds instead.
To always return reverse evens, there's two basic strategies:
- compute the starting position based on the list size
- extract the even index values first, then reverse them
Either one will pass the challenge when implemented correctly.